I’ve struggled with something similar. Not a complete block, but difficulty saying my name due to the first letter. Do you stutter when saying your name in any context, like when starting a sentence or in the middle? I’ve had the same issues, mainly when starting a sentence. I’ve modified to say “My name is…” or “I’m… “, etc. Doesn’t always work, but reduced the stuttering significantly. I’ve also found if I’m feeling nervous, saying some words that I’m confident I’ll pronounce normally, can give me confidence going forward. Like when meeting some, “Nice to meet you, I’m…”. Hoping things improve. Most people won’t even remember it happening, even when we think about it weeks later.