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In the entire world, Jaehwan (Jaehwan ) is a very rare gender-neutral forename. Very seldom, Jaehwan is the last name as well as the forename.
재환
So, Han, Hue, Yoo, Shin, Shim, Seol, Song, Choi, Baek, Byun, Kwon, Park, Jang, Jeon, Jung, Hong, Yang, Youn, Yoon, Chang, Chung, Noh, Jun, Lim, Lee, An, Ko, Jo, Ju, Ji, Na, Ha, Im, Oh, Yu, Jeong, Yi, Sim, Seo, Ahn, Cha, Cho, Chu, Bae, Kim, Ryu, Goo, Um, and Hwang