Where does “Леанід” come from?

Леанід (Belarusian) comes from Ancient Greek Λεωνίδης — Attic and Ionic form of Λεωνῐ́δᾱς.

Ancestry of “Леанід”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Λεωνίδης	Attic and Ionic form of Λεωνῐ́δᾱς

Леанід — Etymology, Origin & Word History | Etymology Explorer