All the time! I say to people without a stutter that proper nouns of any kind are the worst for me. There's no synonym for my name, the city I live in, etc. that I can substitute in if I'm blocking or stuttering hard. It used to really get me down, and I still get the occasional asshole who laughs and says "what, you don't know your own name?" - but now that I'm in my 30s, I just don't let it get to me like I used to. A Starbucks barista laughed at me recently while blocking on my name (even after I told her I have a stutter) and I got a $25 gift card out of it when I complained to head office - so that was nice, anyway!