About 7.4% of all girls' first names in the United States begin with the letter K...
This makes K a very common initial – only the letters A, S and M are more common to start girls' first names. On the other hand, U and X are the least common initials among girls' first names.
In the USA, the most common girl’s first name with a K is currently Kennedy. Approximately 0.3 % of all newborn girls have been named Kennedy. Other popular girls’ first names with K are Kaylee and Kylie. In the United States, the name Kara for girls is also found occasionally but is actually very rare.