Nijia is of African origin, specifically from Nigeria. It's a unisex name that means 'beauty' in Yoruba, one of the major languages spoken in Nigeria.
"Nijia's popularity peaks twice: first around the late '70s to early '80s with five births each year, then again in the late '90s to early 2000s with seven births each year in 1998 and 1999. Overall, there were thirty-nine Nijias born across these years."