How would you spell my last name in Japanese?

Question:

I already know how to spell my first name , Jennifer, in katakana, but my last name is a bit troublesome. I'm from Finland (although I'm speaking swedish as my main language) so I have a swedish last name.

Rönnblad (often spelled "Ronnblad" because the letter ö only exist in swedish) How would you spell it? Jennifer becomes Jenifaa according to what I've been told by other people.

Please help me. I'm still learning japanese and I haven't learned katakana yet. Only hiragana. >.<

Answer:

Ronnblad spells ﾛｰﾝﾌﾞﾗﾄﾞ !