Usernames?

Ok, so I've forgotten the গুপ্তশব্দ for my old YouTube account cos my dad accidentally deleted my PowerPoint with all my passwords on it (yes, I'm that forgetful.), but I don't know what to call it! Any ideas?

Thanks!!!
Ps, please don't be offended if I mix and match, it means I প্রণয় your idea paired with another!!