SON
Note that the languages that lack a reflex of the original word for a "son" and those are: Latin, Celtic, Latvian also lack the corresponding word for a "daughter".
Because it is one of the most important words for a father it is then worthy to trace back its origins in history. First of all Sanskrit "सूनु (sūnú)" from Sintashta Culture is connected to a Lithuanian "sūnus" but also to all forms in oldest Germanic languages as "sunu", meaning that "sunu" was already present in a Corded Ware Culture speaking area. It means that sunu is a word that is literally 5000 years old. In Slavic languages its original form was still present in the times of Old Church Slavonic as "сꙑнъ ⱄⱏⰺⱀⱏ (synŭ)".
Avestan form "hunu, hūnuš" proves that most of the initial Avestan letters "H" come from an older "S" giving us "sunu, sūnuš".
SUN-
Gothic: 𐍃𐌿𐌽𐌿𐍃 (sunus)
Lithuanian: sūnus
Old Prussian: sunun (accusative singular)
Sanskrit: सूनु (sūnú) ("son, child, offspring, a younger brother, a daughter's son")
Old English: sunu
Old Frisian: sunu
Old Saxon: sunu
Old High German: sunu
Ramsø: ᛋᚢᚾᛅᛦ (sunar)
Old Norse: sunr
Saterland Frisian: Suun
Middle Low German: sune, sȫne
Middle High German: sun, suon, sūn
Middle English: sune
Old Swedish: sun
Elfdalian: sun
Gutnish: sun
Ravensbergisch-Lippisch: Suone
Sauerländisch: Suen
Middle Dutch: suene
Albanian: çun ("lad, boy, son")
HU-
Avestan: hunu, hūnuš
Ancient Greek: υἱύς (huiús), υἱός (huiós)
SYN-
Old Church Slavonic: сꙑнъ ⱄⱏⰺⱀⱏ (synŭ)
Belarusian: сын (syn)
Russian: сын (syn)
Rusyn: сын (sŷn)
Ukrainian: син (syn)
Czech: syn
Kashubian: syn
Polish: syn
Slovak: syn
Lower Sorbian: syn
Upper Sorbian: syn
SIN-
Bulgarian: син (sin)
Macedonian: син (sin)
Serbo-Croatian: си̑н, sȋn
Slovene: sȋn
SE-
Tocharian A: se
Danish: -sen
German: -sen
Dutch: -sen
Dutch: zeun
Afrikaans: seun
Plautdietsch: Sän
SON-
Middle English: sone
English: son
Scots: son
Westmünsterländisch: Sönn, Sonn, Sonne
Middle Dutch: sōne
Middle High German: son
Sauerländisch: Sōn
German: Sohn
Old Norse: sonr
Icelandic: sonur, -son
Faroese: sonur, -son
Norn: son
Norwegian Nynorsk: son
Norwegian Bokmål: sønn, -son
Old Swedish: son
Swedish: son, -son
Danish: søn
Norwegian: sønn
German Low German: Söhn
Dutch: zoon
West Frisian: soan
Old Prussian: souns
Tocharian B: soṃśke
SOY
Tocharian B: soy
Pashto: زوي (zōy)
SAN
Westrobothnian: sahn, -sa, -s
US-
Armenian: ուստր (ustr)
Non Indo-European languages:
Burmese: သား (sa:)
Basque: seme
Article published on the 30th of October 2018.