Tetsu is a Japanese given name, derived from the characters "鉄" (tetsu) meaning iron and "夫" (fu) meaning husband. It's often used for males but can also be given to females in some cases. The name Tetsu holds significant cultural value in Japan, as it has been popular among royalty, nobility, and prominent figures throughout history. For instance, one of the most well-known historical figures with this name is Emperor Tetsuma, who ruled during the 17th century. Today, Tetsu remains a respected and widely-used given name in Japan.
"Tetsu is an uncommon name, with only five babies named Tetsu born each year on average since 1998."