Almost every sixtieth girl's first name in the USA begins with the letter I…
This means that the initial I is found much less frequently than average. On average, each letter appears as an initial in about 3.8 % of all girls' names, considering the 26-letter English alphabet. However, 3.8 % is just the average. Of course, the initials of girls' first names aren’t that evenly distributed, with some letters being rarer than others. In the US, the initials A and S are particularly frequent for girls' first names, while very few names begin with the letters U and X.