Germanic Cultural Reconstructions

An asterisk (*) indicates a hypothetical or reconstructed form. Forward slash (/) separates singular from plural forms. The more common anglicized forms of the Norse words are in parenthesis. An important disclaimer: I'm a complete amateur, and the hypothetical Old and Modern English forms are my work, and are not of any use in a serious setting like academia.

Proto-Germanic is the hypothetical language that is the common ancestor of all Germanic languages. Living Germanic languages are Afrikaans, Danish, Dutch, English (with significant borrowing from Romance languages), Faroese, Frisian, German, Icelandic, Norwegian, Scots, Swedish, and Yiddish (with significant borrowing from Aramaic). Extinct Germanic languages include Burgundian, Gothic, Gutnish, Lombardic, Norn, Vandalic, the early forms of the living languages (such as Old English and Middle Dutch), and the mother-tongues of the branches (such as Proto-East Germanic, the ancestor of Burgundian, Gothic, Vandalic, and possibly Lombardic).

Old Norse, which follows Proto-Norse, is the last common ancestor of the Nordic languages (Danish, Faroese, Gutnish, Icelandic, Norn, Norwegian, and Swedish). Norse mythology is the best-recorded of all the branches of Germanic mythology, being the last to be replaced by Christianity. As such, it is the most familiar form of German mythology to modern people.

Old English is the language spoken by the Anglo-Saxon tribes that conquered what is now England in the 400s, and is the basis for Modern English. Although not as well documented as Norse mythology, there is a fair amount of information about Anglo-Saxon mythology. Old English is also the most logical place to start when constructing hypothetical Modern English forms for words that didn't survive into Modern English. (Religious/mythological terms mostly fell out of use after Christianization, and kinship and legal terms mostly fell out of use after the Norman invasion, which forced the French legal system on the English.)

Abreviations
PGer = Proto-Germanic (c. 500—250 BC)
ON = Old Norse (c. AD 700—1300)
OE = Old English (c. AD 200—1100)
ME = Middle English (c. AD 1100—1500)
NE = Modern English (c. AD 1500—present)

Beings
Proto-Germanic Old Norse Anglo-Saxon/Old English Modern English Meaning
*aidaz + *etunaz eldjǫtunn/eldjǫtnar *ǣleoten/ǣleotenas *Ealettin/Ealettins Fire Giants
(OE ǣl "fire" only survives in "anneal" from "onǣlan")
*albaz álfr/álfar ælf/ælfas elf/elves nature spirits, originally ancestral spirits, possibly with meaning "shining/white"
German folklore has the alp, an incubus-like night demon, and erlking (elf-king), a death spirit
*ansuz Áss/Æsir Ōs/Ēs *Oose/Eese primary pantheon, cultural and cosmological deities
*bergoz + *reisan bergrisi/bergrisar *beorgrisere/beorgriseres *Barrowriser/Barrowrisers Mountain Giants
*derk + *albaz dökkálfr/dökkálfar *deorcælf/deorcælfas *Darkelf/Darkelves Dark Elves, (sometimes) black-skinned, ancestral smith spirits
possibly synonymous with "dwarf"
*dwergaz dvergr/dvergar dƿeorg/dƿeorgas Dwarf/Dwarfs dwarfs (subterranean smith spirits)
Northumberland folklore includes duergar, possibly borrowed from late Norse dvergar
*etunaz jǫtunn/jǫtnar eoten/eotenas ettin/ettins giants, possibly with meaning "man-eater"
Only surviving case in NE is the three-headed antagonist and titular character in the English folktale The Red Ettin
Tolkien's "ent" is from an alternate OE form
*guda guð god/godas god/gods generic term for deities
*hrím + *þurisaz hrímþurs/hrímþursar *hrīmþyrs/hrīmþyrsas *Rimethurse/Rimethurses Frost Giants
*kubon + *guda   cofgod/cofgodas *Covegod/Covegods house spirits (OE "cofa", which meant "chamber" > NE "cove", a protected inlet)
Possible origin of the hob of English folklore
Other house spirits include German Kobold, Galgenmänn, Heinzelmänn, Klabautermann (actually a ship spirit), and Kofewalt
*landom + *wextiz landvættr/landvættir *landƿiht/landƿihtas *Landwight/Landwights chthonic spirit
*liŋxto + *albaz ljósálfr/ljósálfar *leohtælf/*leohtælfas Lightelf/Lightelves Light Elves, sun spirits
*nikwuz nykr/nykar nicor/nicoras Neck/Necks water spirits
Sussex knucker, a water dragon, also derives from nicor
Other cognates include German Nix/Nixe, Swedish näck Norwegian nykk, Danish nøk, Icelandic nykr
*reisan risi/risar *risere/riseres *riser/risers giants, possibly with meaning "to rise/stand up" i.e. "towering"
*saiwaz + *wextiz sjövættr/sjövættir *sǣƿiht/sǣƿihtas *Seawight/Seawights sea spirit
*swartaz + *albaz svartálfr/svartálfar *sƿeartælf/*sƿeartælfas Swartelf/Swartelves Black Elves, black-haired, subterranean spirits
possibly synonymous with "dwarf"
  Troll Troll Troll nature spirits
origin of the word is unknown
Faroe, Orkney, and Shetland islands have trow and drow
*þurisaz þurs/þursar þyrs/þyrsas *thurse/thurses giants and monsters, possibly with meaning "blood-thirsty"
May have survived into NE in a single placename: the valley of Thursbitch
*wen Vanr/Vanir *Ƿan/Ƿen *Wan/Wen (rhymes with man/men) secondary pantheon, nature deities
*wextiz vættr/vættir ƿiht/ƿihtas wight/wights nature spirit, with meaning "being" (such as "human being")
*wurmi ormr/ormar ƿyrm/ƿyrmas wyrm/wyrms worm, snake, dragon
Deities and Heroes
Proto-Germanic Old Norse Anglo-Saxon/Old English Modern English Meaning
*dagaz Dagr (Dag) Dæġ *Day god (oose), personification of day
*erþo Jörð (Jord) Eorðe *Earth goddess (oose), personification of the Earth
*erminaz   Eormen *Eermen mythical ancestor of the Hermiones
*frijaz Freyja (Freya) Frēo *Free goddess (wan) of passion
*frijō Frigg Frīġe *Frie (homophone with "fry") goddess (oose) of love
*god Gautr (Gaut) Ġēat *Yeat mythical ancestor of the Geats
*heimaz + *dall Heimdallr (Heimdall) Hāma *Home guardian of the gods (eese)
*ingwaz Yngvi Ing *Ing mythical ancestor of the Ingaevones
*mænon Máni Mōna *Moon god (oose), personification of the Moon
*nerþuz Njörðr (Nord) Neorð *Nearth god (wan) of the sea
*naxt Nótt Niht *Night goddess (oose), personification of night
    Seaxnēat *Saxneat mythical ancestor of the Anglo-Saxons
*sunnon, *sowilo Sól (Sol) Siġel *Sun goddess (oose), personification of the Sun
*teiwaz Týr (Tyr) Tīƿ *Tue god (oose) of battle
*þunraz Þórr (Thor) Þunor *Thunder god (oose) of sky
*wēlanduz Völund (Volund) Ƿeyland *Weyland semi-devine smith (sometimes named as king of the elves)
*wōdanaz Óðinn (Odin) Ƿōtan *Wooden (oo as in pool) god (oose) of wisdom
Places
Proto-Germanic Old Norse Anglo-Saxon/Old English Modern English Meaning
*albaz + *heimaz Álfheimr (Alfheim) *Ælfhām *Elfham realm of the elves (especially Lightelves)
*ansuz + *gardaz Ásgarðr (Asgard) *Ōsġeard *Ooseyard realm of the Eese gods
*etunaz + *heimaz Jötunheimr (Jotunheim) *Eotanhām *Ettinham realm of the Barrowrisers (Mountain Giants)
*haljō Hel Hel Hell underworld
*īsarna + *widuz Járnvið (Jarnvid) *Īsernƿudu *Ironwood realm of Trolls
*medja + *gardaz Miðgarðr (Midgard) Middanġeard *Midyard physical world, realm of humans
"Middle-Earth" from misinterpretation as "middaneard"
*? + *heimaz Múspellheimr (Muspellheim) *Muspellhām *Muspelham realm of the Ealettins (Fire Giants)
*nibulō + *heimaz Niflheimr (Niflheim) *Neoƿolhām *Neelham "Fog Home", realm of the Rimethurses (Frost Giants)
*niþar + *felþuz Niðavellir (Nidavellir) *Niþerfeldas *Netherfields subterranean realm of the Dwarfs
*niþar + *felza Niðafjöll (Nidafjöll) *Niþerfellas *Netherfells mountain range in Hell
*swartaz + *albaz + *heimaz Svartálfaheimr (Svartalfaheim) *Sƿeartælfhām *Swartelfham realm of the Black Elves
*ūt + *gardaz Utgarðr (Utgard) *Ūtġeard *Outyard realm of giants
*wen + *heimaz Vaniheimr (Vaniheim) *Ƿanhām *Wanham realm of the Wen gods
Timekeeping
Anglo-Saxon/Old English Modern English Meaning
æfter ġeōl *Afteryule first month, reckoned from winter solstice
æfter liða *Afterlith seventh month, reckoned from summer solstice
ǣr ġeōl *Ereyule twelfth month
ǣr liða *Erelith sixth month
blōdmōnað *Bloodmonth eleventh month
ðrimilce *Threemilk fifth month
eostremōnað *Eastermonth fourth month, reckoned from the vernal equinox
frīġedæġ Friday Frīġe's day, sixth day of the week
haliġmōnað *Holymonth ninth month
hreðmōnað *Rethmonth third month
mōnandæġ Monday Mōna's day, second day of the week
sæternesdæġ Saturday Saturn's day (borrowed directly from the Romans), seventh day of the week
solmōnað *Solmonth second month
sunnandæġ Sunday Siġel's day, first day of the week
tīƿesdæġ Tuesday Tīƿ's day, third day of the week
þunresdæġ Thursday Þunor's day, fifth day of the week
ƿēodmōnað *Weedmonth eighth month
ƿinterfylleð *Winterfall tenth month, reckoned from the autumnal equinox
ƿōdnesdæġ Wednesday Ƿōtan's day, fourth day of the week

Days were reckoned from sundown, so "sunnanniht" (*Sunnight) would be Saturday night not Sunday night. Remnants of this can be seen in Christmas Eve (the night before Christmas) and Halloween (All Hallows' Eve, the night before All Saints' Day).

Events
Proto-Germanic Old Norse Anglo-Saxon/Old English Modern English Meaning
  blót blōt *bloot sacrificial ceremony
*jíxwlan jól ġeōl Yule winter solstice
*þengan þing þing *Thing event, meeting, object
Kinship
Proto-Germanic Old Norse Anglo-Saxon/Old English Modern English Meaning
*āiþumaz   āðum *othum brother-in-law
*awōn ái ēam *eem grandparent, uncle (OE ēam was chiefly a maternal uncle)
*brōþēr bróðir brōðor brother brother
*doxtēr dóttir dohtor daughter daughter
*faþēr faðir fæder father father
*gumēn gumi guma *goom man/husband (NE "bridegroom" by mistaken association with unrelated "groom")
*kwinōn kona cƿēn queen woman, especially married (NE sense of "female ruler" from "king's wife")
*mannēn maðr mann man person ("adult human male" in NE)
*mōþēr móðir mōdor mother mother
*snuzāz snor snoru *snor daughter-in-law
*sunūz sunr sunu son son
*swīxraz svára sƿēor *sweer father- or mother-in-law
*swizjaz systir sƿeostor sister sister
*taikraz   tācor *toker brother-in-law (specifically husband's brother)
*wīban víf ƿīf wife woman ("woman" from OE wīfmann "adult female" + "person")
*wirāz ver ƿer *wer man (e.g. "werwolf" : man + wolf)
*xusan + *bauwa húsbóndi hūsbonda husband "house-dweller," male head of household (OE verb būan "to dwell" extinct in NE)
Legal Terms
Proto-Germanic Old Norse Anglo-Saxon/Old English Modern English Meaning
*dōmoz dómr dōm doom law, judgement
*fangan ("to catch")   ġefangen (past participle of fōn "to catch") *fangness prison (by analogy with Dutch gevangenis, German Gefängnis)
  *fangner prisoner (by analogy with Dutch gevangene, German Gefängner)
  lagu lagu law law
*rehta rétr riht right justice, right, entitlement, proper due
  *rihtere *Righter Judge (by analogy with Dutch richter and German Richter)
*mōtom mót mōt Moot meeting, legislative assembly
*xafta hapt hæft *haft prisoner, captive, or slave
Titles and Occupations
Proto-Germanic Old Norse Anglo-Saxon/Old English Modern English Meaning
*alðoz + *mann   ealdormann Alderman "elder man," king's representative in a shire (modern use as municipal legislative officer)
  jarl eorl Earl nobleman (formalized after Norman Conquest as equivalent to a count)
*karlaz karl ċeorl churl freeman, peasant (above thrall, below thane)
ON "karl" is the source of the name Carl
    cniht knight originally meant "(servant) boy," came to mean a warrior in the service of the king
*kuniŋgaz konungr cyning King male ruler
    rēfa Reeve local official
*ridanan   *rīdanere *Rider cavalry officer
by analogy with Danish and Dutch ridder, German Ritter, and Icelandic riddari, all meaning "knight"
    scīrġerēfa (scīr + rēfa) Sheriff ("shire-reeve") shire (county) official (US chief of county police force)
*sagjáz seggr seċġ *sedge man, warrior, hero
*þigna þegn þeġn Thane landowner, gentry, freeman (replaced by "baron" after Normon Conquest)
*þrāhiloz þrǽll þrǣl thrall slave, servant
*xailaga ("healing") heilagr hāliġ ("holy") → hālġa hallow holy person, saint
Other
Proto-Germanic Old Norse Anglo-Saxon/Old English Modern English Meaning