Hi Vlad, thanks for you answer!
I never had the intention to trick the system out by using a different name.
I am just quite worrying whether I can apply to another country at the same company or not. I applied for US and Middle East offices first, and thought that if I got rejections I could still apply for my home country offices (Germany). I think I made a mistake and should have applied directly for German offices as well, but I was afraid that they would not be willing to schedule an interview because I am currently in the US for my studies.
I searched at the Q&A here and people said that MBB probably do not share their blacklists across the offices of all countries. For example, a rejection for US offices should only prohibit me from applying to US offices for the next 1.5-2 years, but not worldwide...