Remove both. Since my middle name is literary blank like the required middle name for birth certificate. But father have funny idea to put _ on it. If remove both first and last name my name will be _
Depends on the situation i guess. In games where only a first name is needed i tend to use Alejandro because i kinda like the sound of it. I also like Gunnar Gunnarson. Don‘t ask me why i just think it‘s a funny name.
In the real world i am quite pleased with my name so nothing comes to mind if i would have to change it.