Spanish word ballena comes from Proto-Indo-European *bʰleh₁s-, and later Latin ballaena (A whale.)
*bʰleh₁s- (Proto-Indo-European)
φάλλαινα (Ancient Greek)
φάλαινα (Ancient Greek)
ballaena (Latin)
A whale.
ballaen (Latin)
ballena (Old Spanish)
ballena (Spanish)
Baleen, whalebone. Whale.