I know Iselin can be a surname but it is also a female fn. I've read this name in a fairy tale and it is used in Norway. But I think it might be
German, though perhaps not used there nowadays?
"You sought a flower and found a fruit. You sought a spring and found a sea. You sought a woman and found a soul. You are disappointed."
"It does not become me to make myself smaller than I am." (
Edith Södergran 1891-1923)