noun
Refers to the third-born son in a family. Also used as a male given name, often for a third son.
See also: 三男
彼は三郎という名前の三男だ。
He is the third son, named Saburō.
noun
Occella iburia (species of poacher)
A species of poacher fish. Usually written in katakana as サブロウ.
サブロウは北海道の深海で見られる魚だ。
Saburō is a fish found in the deep sea off Hokkaido.
三男 is the standard word for 'third son' in modern Japanese, while 三郎 is an older or name-like term.
From 三 (third) and 郎 (son, young man). The fish name is likely a phonetic borrowing or coincidence.