About one in fifteen boys' first names in the United States begins with the letter M…
This makes letter M an above-average initial for boys' first names – with 26 letters of the alphabet, each letter is the initial of a boys' first names by an average of 3.8 %. Reality is always different, of course: Some initials appear particularly frequently, while others are much rarer. The most common initials among boys' first names in the United States are J and A, while very few names begin with the letters U and X.