Where does “Gecarcinus” come from?

Gecarcinus (English) comes from Translingual Carcinus, from Ancient Greek καρκίνος, from Proto-Indo-European karkros.

Ancestry of “Gecarcinus”, step by step

Step	Language	Word	Meaning
1	Translingual	Carcinus	—
2	Ancient Greek	καρκίνος	crab; Cancer, the zodiac sign; sore, ulcer,...
3	Proto-Indo-European	karkros	—