Surname 於 (於 
, Yú 
) , in the world, is a common last name. The cognomen 於 is characteristic of China, where it is quite a rare surname, and Myanmar, where it is a rare surname. Very seldom, 於 is the forename as well as the last name.
| 於崇文 Chinese geochemist (1924–2022), CN (b. 1924) |
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| 於梨華 Chinese writer, TW (b. 1929) |
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於之莹 Chinese Go player, CN (b. 1997) |
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