Isamu is of Japanese origin, derived from the word 'isamu' which means 'brave'. It is a popular given name among males in Japan. The name Isamu has been used prominently throughout history and literature, including notable figures such as Isamu Noguchi, a renowned sculptor and designer known for his modernist style.
The name Isamu appears to have had its heyday in the early 20th century, with a peak of 40 births in 1922. However, it experienced a significant decline after the 1930s, and while there were some fluctuations in the late 20th and early 21st centuries, its popularity has remained quite low overall.