Callum is a spelling variant of the English and Scottish name Calum.
Callum is also a derivative of the English and Scottish name Malcolm.
Callum is fairly popular as a baby name for boys. The name has been rising in popularity since the 2000s; prior to that, it was of sporadic use only. At the modest peak of its usage in 2015, 0.018% of baby boys were named Callum. It ranked at #683 then. Out of the group of boy names directly related to Callum, Malcolm was the most commonly used in 2015. It was used 98% more than Callum in that year.
Baby names that sound like Callum include Calum (English and Scottish), Kallum (English and Scottish), Caelan (Scottish), Cailean (Gaelic and Scottish), Calam, Calan, Calhoon, Calhoun (English), Calhoune, Calim, Calin (English), Callan (English and German), Callhoun, Callin, Callyn, Calvien, Calym, Calyn, Cashlin, and Celyn (Welsh).
† Pronunciation for Callum: K as in "key (K.IY)" ; AE as in "at (AE.T)" ; L as in "lay (L.EY)" ; AH as in "mud (M.AH.D)" ; M as in "me (M.IY)"