Cognomen 吾郎 (吾郎 
, Hayashibe 
) , across the world, is an extremely rare last name. The surname 吾郎 is habitual in Northern America, particularly the United States, where it is an extremely rare surname. More prevalently, 吾郎 is the forename as well as the last name.
| 山中 吾郎 (b. 1910) |
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| 遠井 吾郎 Japanese baseball player, JP (b. 1939) |
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| 大橋 吾郎 Japanese actor and seiyū, JP (b. 1956) |
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