Throughout the world, Iwatsu (Iwatsu 
) is a very rare male forename. The forename Iwatsu is characteristic of Eastern Asia, particularly China, where it is an extremely rare male name. More prevalently, Iwatsu is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Iwatsu | China, United States, India, Canada, New Zealand |
Ko, Andrea, Claire, Bertha, Ronnie, Daniel, Taylor, Nicole, Noboru, Hiromi, Yasuko, Yoshio, Yvette, Yvonne, Hiroshi, Yousuke, Masayuki, Penelope, Danielle, Hiroyuki, Hirofumi, Masayoshi, Sayaka, Yoshihisa, Masami, Hideo, Ei, Man, Ken, Mimi, Cory, Joey, Jiro, Yuka, Misty, Shoji, Akira, Kazuo, Kenji, Kerry, Kunio, Penni, Ricka, Ryuki, David, Jinha, Jitsu, Yasuo, and Antoinette