Ok ok this is a very stuped question but its kind of buging me. But Why do Colossus ans Magik have different last names ? There brother and sister and the last names are a little different ? Colossus last name is Rasputin and Magik's last name is Rasputina. There simuler but different.

I assume that it's a typo on her bio page. Their parents are the same. Unless it's a Russian thing. -Shrugs-

Some languages do a masculine/feminine thing. Could be that.

It's a Slavic thing... something to do with grammatical gender and certain suffixes being added to a root surname to denote gender... or something like that...

It's a Slavic thing... something to do with grammatical gender and certain suffixes being added to a root surname to denote gender... or something like that...

Yup it's a Russian thing. 
 
Male - Rasputin
Femaile - Rasputina
Male - Romanoff
Female - Romanova
Male - Ivanoff
Female - Ivonova