Reia, of Japanese origin, is a melodic and distinctive given name, composed of the characters 'rei' (霊) meaning spirit or soul, and 'a' (あ) which can denote harmony or peace. The combination suggests a profound and serene essence. Historically, it has been used as both a feminine and masculine name in Japan, though its usage varies depending on regions and eras.
The name Reia experienced a significant increase in popularity from the late 2000s onwards, with a steady rise from 6 births per year between 1975 and 2008, to a peak of 31 births in 2021. The total number of births over this period is 234.