About 8.4 % of all first names in the United States begin with the letter J…
This makes J the second most common initial of all popular first names in the United States. A is the most common letter to start a name. On the other hand, U and X are the least common initials.
In the US, the most common boys’ name with the initial J is Jacob, and the most popular girls’ name is Julia. Recently in the United States, approximately one in 125 boys has been named Jacob, and approximately 0.2% of all newborn girls are named Julia. Other well-known names with a J are Jade and James. The names Jensen and Jenna, 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.