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Around the globe, 昌也 (Masaya , 昌也 ) is quite a rare mostly male, but seldom female forename. The given name 昌也 is habitual in Japan, where it is a rare male name, Nigeria, where it is a very rare epicene name, and Philippines, where it is a very rare mostly girly, but seldom male name. Not in comparison with a country's population, it most frequently occurs in Japan, India, and Nigeria. Also, 昌也 is the last name as well as the forename.
昌也 is also a name for the fictitious and mythical characters: Masaya Kubota , the character from Kuroko's Basketball.