Tatsuo is a unisex given name of Japanese origin, derived from the elements "tatsu" meaning "eight" and "o" meaning "honorable". This name has been popular in Japan for centuries, often used for both boys and girls due to its versatile character. It gained significant international attention following World War II as many Japanese individuals with this name immigrated or traveled abroad, contributing to its recognition worldwide. Despite its traditional roots, Tatsuo remains a contemporary choice for parents seeking a unique yet familiar name option for their child today.
The name Tatsuo experienced significant fluctuations in popularity between 1915 and 1940, with a notable spike in 1928 when there were 39 births, far exceeding any other year during this period. The total number of babies named Tatsuo during these years was 222.