Kellsie is of American origin, a modern invention that blends elements from popular names like Kelly and Jesse. It gained popularity during the late 20th century, with its first recorded usage in the United States being in 1984. The name Kellsie is considered unisex, although it's more commonly used for females. Its meaning is not explicitly defined, but it could be interpreted as 'firstborn' or 'striving', derived from the Irish surname Kelly and the English name Jesse respectively. As a two-syllable name with a soft ending, Kellsie has a pleasant ring to it, making it appealing to parents seeking a distinctive yet approachable name for their child. Spelling variations include Kelsy, Kellsey, and Kelcey.
"The name Kellsie experienced a surge in popularity from 1987 to 1994, with a peak of 43 births in both 1994 and 1996. However, it saw a significant decline thereafter, with the most recent year showing only 6 births (2014)."