Eivor / Øyvor / Eyvor / Ejvor / Ejvår / Ojvå
ei- :
Can come from either Old Norse "ey" (island) or Old Norse "auja" (luck)
-vor :
Can come from from either Old Norse "verja" (protection) or Old Norse "varr" (wise) or Old Norse "wara" (careful)
Regards,
Satu