Where does “Henna” come from?

Henna (Finnish) comes from Finnish Henriikka, from Swedish Henrika, from Swedish Henrik, from Old Swedish Henrik.

Ancestry of “Henna”, step by step

Step	Language	Word	Meaning
1	Finnish	Henriikka	—
2	Swedish	Henrika	—
3	Swedish	Henrik	Henry
4	Old Swedish	Henrik	—

Henna — Etymology, Origin & Word History | Etymology Explorer