五郎

Goro is also a common Japanese name meaning "fifth son", from the words "go" (five) and "ro" (son).

In the old days, peasants didn't give their sons proper names - they simply spoke of them according to their birth order. Thus, other common names were "first son" (Ichiro), "next son" (Jiro), "third son" (Saburo), and "fourth son" (Shiro). Although all Japanese have given names now, these names are still extremely common (Ichiro Suzuki, for example). They no longer necessarily imply birth order, however.