I was reading it as "Hyyppönen" until I read this comment and looked at it more carefully :P Even though o and ö are not interchangeable in Finnish, I suppose

I was reading it as "Hyyppönen" until I read this comment and looked at it more carefully :P Even though o and ö are not interchangeable in Finnish, I suppose just o is preferable to the "oe" abomination that is occasionally used. Especially if your name happens to be Töölö or something.