Changing the owner of prepaid sim card

Hi O2 Team,

I have been using the O2 Loop M sim card for a year now, which my boyfriend ordered for me under his name. Now he's moving out of Germany but I'm still going to be here so I want to change the sim card data in my account to be under my name instead. I am only able to change the address but the name is locked. Any way I can change this?

Thanks in advance!