Kellar is an uncommon given name of American origin, derived from the occupational surname Keller, which was originally an occupation for a cooper or barrel maker. The name Kellar has been used sparingly over the years but has gained some popularity in recent times due to its unique sound and spelling. It is often spelled with two L's, unlike the more common variant with one L, Keller. As of 2018, it was ranked 5,497th among boys' names in the United States.
The name Kellar experienced fluctuations in popularity over the years, with peaks in 1999 (8 births), 2006 (11 births), and 2013 (8 births). However, there were also periods of decline, such as between 2002 to 2005 with only one recorded birth each year. The most recent years show a stable pattern, with five births in both 2018 and 2022. In total, there have been 98 babies named Kellar since 1999.