Old Norse þróttr

← Proto-Germanic *þruhtuz (inherited)

← Proto-Indo-European *treg- (derived)

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

→ Old English þroht (cognate)

→ Breton trec'h (cognate)

→ Icelandic íþrótt (mention)

→ Icelandic þróttur (inherited)

→ Old Irish trén (cognate)

→ Swedish idrott (mention)