Of all first names in the United States, about 3.7 % begin with the letter B…
This means that the initial B is neither particularly common nor particularly rare – with 26 letters in the alphabet, each initial occurs on average in 3.8% of all names. Of course, first letters aren’t (exactly) evenly distributed as initials: On the contrary, some initials are especially common, while others are really rare. The most common initials in the United States are A and J, while fewer first names begin with the letters U and X.
In the US, the most common boys’ name with the initial B is Benjamin, and the most popular girls’ name is Brooklyn. Recently in the United States, approximately one in 135 boys has been named Benjamin, and approximately 0.3 % of all newborn girls are named Brooklyn. Other well-known names with a B are Bella and Brayden. The names Brendan and Briana, on the other hand, are also well known in the US and have been used occasionally in recent years, but are generally still quite rare.