Kailub is of American origin, derived from the Hawaiian word 'kahi' meaning 'first' and combined with the Hawaiian suffix '-lu'. This unique name gained popularity in the United States during the mid-20th century and has since been adopted by families seeking distinctive names for their children. It is often associated with a strong, independent spirit, reflecting its origins from the islands of Hawaii.
The name Kailub appears to have had some popularity around the late 2000s and early 2010s with a total of 22 births recorded between 2008 and 2012, but there was a notable drop-off in usage after 2012.