There exists a certain logic in wondering that languages spoken in neighbouring nations have to be carefully linked. However, that’s not the situation with Finnish. The /j/ once the letter ⟨i⟩ is extremely weak or there isn't a /j/ in the least, but in composing it's used; for instance: urheilija. https://dvurnif.sharebyblog.com/26379231/fascination-about-finnish-lifestyle