Cognomen 由佳 (由佳 
) , in the entire world, is a very rare family name. The surname 由佳 is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 由佳 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 由佳 | China |
| 畑下 由佳 JP (b. 1991) |
|
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| 杉崎 由佳 (b. 1991) |
|