Mcclellan is an English surname derived from the Scottish clan MacClellan, which was originally based on the family's territory in Scotland. It is thought to mean 'son of Clell' or 'son of Cella', with 'Clell' or 'Cella' being pet forms of the given name Cellach. The name has been anglicized over time and can also be spelled McClellan, McClelen, or other variants.
The name McClellan appears to have had its most popular years between 1940 and 1941, with a total of 15 births during these two years alone. Despite fluctuations over the decades, there have been consistent birth occurrences, with several years seeing five or more babies named McClellan. However, the name's popularity has not shown significant growth or decline over time, remaining relatively stable with a total of 89 recorded births across the provided years.