Where does “Pachyptile” come from?

Pachyptile (French) comes from Translingual Pachyptila, from Ancient Greek πᾰχῠ́ς, from Proto-Hellenic *pəkʰús.

Ancestry of “Pachyptile”, step by step

Step	Language	Word	Meaning
1	Translingual	Pachyptila	—
2	Ancient Greek	πᾰχῠ́ς	thick
3	Proto-Hellenic	*pəkʰús	—