Inna

Also Latvian: https://personvardi.pmlp.gov.lv/index.php?name=Inna

Also Finnish name. Finnish name day August 29.
https://fi.wikipedia.org/wiki/Inna
https://almanakka.helsinki.fi/en/name-days/name-day-search.html

Also Moldovan: https://ro.wikipedia.org/wiki/Inna_Gliznu%C8%9Ba
https://ro.wikipedia.org/wiki/Inna_%C8%98upac

I’ve heard this as a nickname for Irena.

Also Estonian diminutive of Ingrid and Linda.

Inna is also used in East Frisia (Tammena lists it for the 18th to the 20th century). Tammena explains it as a short form of names containing the Name element #AGIN# (or #EIN#).