stammer

verb

1. (intransitive)To keep repeating a particular sound involuntarily during speech.
2. (transitive)To utter with a stammer, or with timid hesitancy.

   “He blushed, and stammered a few words of apology.”

   “The high school had a send-off in my honour. It was an uncommon thing for a young man of Rajkot to go to England. I had written out a few words of thanks. But I could scarcely stammer them out. I remember how my head reeled and how my whole frame shook as I stood up to read them.”

noun

1. The involuntary repetition of a sound in speech.

   “She said goodbye in a stammer.”

2. A speech defect whereby someone speaks with a stammer

name

1. A surname from German.