köken: From Middle High German wāpen (“weapon; coat of arms”), from Middle Low German wâpen (“weapon; coat of arms”). Doublet of Waffe (“weapon”), the High German form. The two forms were originally synonymous, but were semantically separated in early modern German.
köken: From Old Swedish vapn, vakn, from Old Norse vápn, from Proto-Germanic *wēpną. Attested in the “weapon” sense since the 11th century, in the heraldic sense since 1430–1450, and in the “military branch” sense since 1855.