Where does “ksii” come from?

ksii (Finnish) comes from Ancient Greek ξεῖ, from Phoenician 𐤎‬.

ksii (Finnish): xi

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	ξεῖ	xi, the name for the fourteenth letter Ξ, ξ of...
2	Phoenician	𐤎‬	—

ksii — Etymology, Origin & Word History | Etymology Explorer