Where does “dauphin” come from?

dauphin (Middle French) comes from Old French dalphin, from Latin delphīnus, from Ancient Greek δελφίν, from Ancient Greek δελφύς, from Proto-Indo-European gʷelbʰ- — the womb.

Ancestry of “dauphin”, step by step

Step	Language	Word	Meaning
1	Old French	dalphin	—
2	Latin	delphīnus	—
3	Ancient Greek	δελφίν	—
4	Ancient Greek	δελφύς	the womb
5	Proto-Indo-European	gʷelbʰ-	the womb

Every word from Proto-Indo-European gʷelbʰ- →