Where does “Delonix” come from?

Delonix (Translingual) comes from Ancient Greek ὄνυξ, from Proto-Indo-European h₃nogʰ- — claw, nail; nail.

Ancestry of “Delonix”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ὄνυξ	claw, nail, hoof, talon; Anything which resembles...
2	Proto-Indo-European	h₃nogʰ-	claw, nail; nail

Delonix — Etymology, Origin & Word History | Etymology Explorer