Old Norse ský

← Proto-Germanic *skiwją (inherited)

← Proto-Indo-European *(s)kew- (derived)

→ English sky (derived)

→ Old English sceo (cognate)

→ Danish sky (inherited)

→ Middle English sky (borrowed)

→ Middle English skew (borrowed)

→ Faroese skýggj (derived)

→ Westrobothnian sjy (inherited)

→ Old Swedish sky (inherited)

→ Icelandic ský (inherited)

→ Norwegian Bokmål sky (inherited)

→ Norwegian Nynorsk sky (derived)

→ Scots sky (derived)

→ Swedish sky (inherited)