←
Proto-Germanic *-iskaz (inherited)
←
Proto-Indo-European *-iskos (inherited)
←
Old Norse -iskr (mention)
→
Faroese -skur (mention)
→
Norwegian Bokmål -sk (mention)
→
Norwegian Bokmål abelsk (inherited)
→
Norwegian Bokmål vegansk (inherited)
→
Norwegian Nynorsk -sk (derived)
→
Old Norse írskr (suffix)
→
Old Norse -iskr (mention)