Viðoy (Faroese) comes from Faroese oy, from Old Norse ey, from Proto-Norse *ᚨᚢᛃᚢ, from Proto-Germanic awjō, from Proto-Germanic agwjō, from Proto-Indo-European h₂ékʷeh₂ — water.
Ancestry of “Viðoy”, step by step
Viðoy traces back through two separate lines of ancestry.