Meaning and Name Origin
Kellen \k(el)-len\ as a boys' name (also used less regularly as girls' name Kellen) is pronounced KEL-en. It is of Gaelic origin, and the meaning of Kellen is "slender". An ancient given name. May be related to Kell, or possibly (Old German) "swamp".
Kellen is an uncommonly occurring given name for men but a very prominent last name for both adults and children (#22159 out of 88799, Top 25%). (2000 U.S. Census)
Presented below is the baby name popularity of Kellen for boys. Kellen entered the list in 1980-1989 and reached its highest position of #337 in the U.S. in the year 2012, and is at #444 presently. (2014 Birth Statistics)
Below is a graphed analysis of the usage of Kellen and affiliated names. Kellan (#385 a year ago) and Kelan are the popular alternative forms of Kellen (#444 a year ago) rated in the Top 1000. These boy names were at the height of their popularity in 2011 and are somewhat less popular today. Kellan (#385) and Kellen (#444) are two of the more fashionable baby names here, with Kellan undergoing a rekindling in usage. (2014 Birth Statistics)
Kellen▲ is pronounced similarly to Collen, Cullen▲, Kalen, Kealan, Keallan, Keallin, Kealon, Keelin, Kelwin, Kelwyn, Killean and Kylen. Other recommended similar baby names are Keller, Kelley▼, Kellven, Kelten, Kelven and Mellen. These names tend to be more frequently used than Kellen.