semä = eye
alternate spelling: semae
Some things Google found for "sema" and "semä":
Semä is a rare last name. Sema is an unusual last name. Sema is an rare feminine first name. In Slovak semä seems to be an archaic or poetic word for seed. In Turkish sema means firmament, sky. There's a Sema Lake in Minnesota near the Canadian border.
Word derivation for "eye" :
Hungarian = szem (which I transliterate to sem)
Finnish = silmä
Samgur = semä