Surname แสงมรกต (แสงมรกต 
, Saengmorakot ) , throughout the world, is a very rare last name. The cognomen แสงมรกต is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, แสงมรกต is the forename as well as the last name.
| โผน แสงมรกต TH (b. 1973) |
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| สุรชัย แสงมรกต TH (b. 1977) |
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