Kenijah is of African origin, derived from the Swahili language. It means 'first born' and is used as both a given name and surname. The name gained popularity in the United States during the late 20th century, particularly among families of African descent seeking unique names for their children.
The name Kenijah had a peak popularity around the early to mid-2000s, with over 10 births each year from 2003 to 2007. However, there was a significant decrease in its usage after 2008, with only five births recorded in 2016. Overall, Kenijah has been given to 113 babies between 1998 and 2016.