Asturian osu, Portuguese usso, Galician oso, Catalan ós, French ours, Italian orso, Aromanian ursu, Romanian urs, Sardinian ursu
Old Irish art "bear," "hero," Middle Welsh arth "bear," Old Breton Ard-, Arth- 'id.,' Gaulish Artio, bear goddess
Albanian arí "bear"
Ancient Greek ἄρκτος (árktos) "bear"
Armenian arǰ "bear"
Sanskrit ŕ̥kṣa- "bear," Young Avestan arša 'id.'
As de Vaan (2014) points out, the word was heavily subjected to taboo distortion, as it was forbidden to speak the name of the bear during a hunt. Thus the word is phonologically warped. The appurtanance of Latin ursus is difficult to explain, Proto-Italic *orsso- should yield **orsus; furthermore, Proto-Italic *orsso- is difficult to explain because Proto-Indo-European *h2rtḱo- should yield **arsso-.