Where does “кайса” come from?

кайса (Russian) comes from Finnish Kaisa, from Finnish Katariina, from Swedish Katarina, from Medieval Latin Catharīna, from Latin Ecaterina, from Ancient Greek Αἰκατερίνη, from Ancient Greek Ἑκάτη, from Ancient Greek ἑκάς — self.

кайса (Russian): kaisa

Definitions

kaisa

Ancestry of “кайса”, step by step

Step	Language	Word	Meaning
1	Finnish	Kaisa	kaisa
2	Finnish	Katariina	Catherine
3	Swedish	Katarina	Catherine
4	Medieval Latin	Catharīna	—
5	Latin	Ecaterina	—
6	Ancient Greek	Αἰκατερίνη	—
7	Ancient Greek	Ἑκάτη	Hecate
8	Ancient Greek	ἑκάς	afar, far off; long after
9	Ancient Greek	ἕ	him
10	Proto-Hellenic	hwe	—
11	Proto-Indo-European	swé	self

Every word from Proto-Indo-European swé →Every word from Proto-Hellenic hwe →Every word from Ancient Greek ἕ →