Surname Furnas (Furnas 
) , all over the world, is a rare last name. The family name Furnas is characteristic of Portugal, where it is a rare surname, the United States, and New Zealand, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in the United States, Portugal, and Brazil.
| VARIANT | COUNTRY |
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| Furnas | Portugal, Canada, Brazil, India, United States |
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robert wilkinson furnas Governor of Nebraska (1824-1905), US (b. 1824) |
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| clifford c. furnas American distance runner, US (b. 1900) |
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| j. c. furnas American writer, US (b. 1906) |
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| sparkle moore furnas (b. 1901) |
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| david w. furnas (b. 1931) |
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| george furnas American linguist, US (b. 1954) |
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| doug furnas American professional wrestler, powerlifter (1959-2012), US (b. 1959) |
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| barnaby furnas American artist, US (b. 1973) |
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| brett j furnas researcher (ORCID 0000-0002-6377-4148) |
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| joshua furnas American football player, US (b. 1984) |
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