Proto-IE: *sokʷ- (-kʷh-)
Meaning: companion, fellow
Old Indian: sákhā (acc. sákhāyam, other cases from sakhi-) m. `friend, assistant, companion'
Avestan: haxay- (haši-) `Gefährte, Genosse, Freunde'
Other Iranian: OPers Haxāmaniš-
Old Greek: opā́ōn, ion. opéōn, myk. o-qa-wo-ni m. `Gefährte, Begleiter', opǟdó-s m. `Begleiter'; aor. aossē̂sai̯ `helfe, beistehen' (от *sm-sokʷ-jo-)
Latin: socius, -a `gemeinsam', socius, -ī m. `Gefährte, Genosse, Teilnehmer, Bundesgenosse', socia f. `Genossin'
Russ. meaning: спутник, товарищ
References: WP II 476 f
Comments: [Quite probably derived from *sekʷe-, the problem is -h-.]
