Cognomen ยงใจยุทธ (ยงใจยุทธ 
, Yongchaiyut , Yongjaiyut ) , in the entire world, is a rare family name. The last name ยงใจยุทธ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, ยงใจยุทธ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yongjaiyudh, Yongjaiyut, Yongchaiyut, ยงใจยุทธ | Thailand |
Yongchaiyud, Yongchaiyudh, Yongchaiyudha, Yongchaiyudt, Yongchaiyuth, Yongjaiyoot, and Yongjaiyuth
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ชวลิต ยงใจยุทธ prime Minister of Thailand, TH (b. 1932) |
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| สะแกวัลย์ ยงใจยุทธ Thai actor, TH (b. 1974) |
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