Tokuichi is a Japanese given name of uncertain origin, though it's believed to mean "abundant" or "rich". It's composed of the kanji characters 徳 (tokui) meaning "virtue" and 一 (ichi) meaning "one". The name has been used throughout history in Japan but became particularly popular during the Meiji period.
"Tokuichi was a popular baby boy name in 1920 with a total of five births that year."