Where does “-ishtë” come from?

-ishtë (Albanian) comes from Serbo-Croatian -ište, from Proto-Slavic -išče, from Proto-Slavic isk-je.

Ancestry of “-ishtë”, step by step

Step	Language	Word	Meaning
1	Serbo-Croatian	-ište	Suffix appended to words to create a neuter noun,...
2	Proto-Slavic	-išče	Denominal, denoting places or spaces; Denominal,...
3	Proto-Slavic	isk-je	—

-ishtë — Etymology, Origin & Word History | Etymology Explorer