Cognomen Opas (โอภาส 
, Opas 
, โอภาศ ) , across the world, is quite a rare last name. The cognomen Opas is habitual in Finland, where it is quite a rare surname, Thailand, and Poland. More frequently, Opas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| โอภาส, โอภาศ | Thailand |
| Opas | Finland, Thailand, Egypt, Poland, Indonesia |
| Oppas | Greece, Myanmar, South Africa, Philippines, Netherlands |
Oppassen, Ôpâ, Õpâ, Опас, พันธ์โอภาส, เชาวน์โอภาส, and แย้มโอภาส
| yrjö opas (b. 1898) |
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| sulo opas Finnish pesäpallo player, FI (b. 1915) |
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| philip opas Australian barrister, AU (b. 1917) |
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michał opas biologist, PL |
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| david opas Australian judge, AU (b. 1936) |
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| opas ruengpanyawoodhi (b. 1955) |
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| opas ruengpanyawut Thai sport shooter, TH (b. 1965) |
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| opas tojira researcher |
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| opas bunkoed researcher (ORCID 0000-0003-2984-6467) |
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| opas traitanon researcher |
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| opas satdhabudha researcher |
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| opas sreshthaputra researcher (ORCID 0000-0001-8367-9642) |
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| petteri opas FI |
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