Surname Armacost (Armacost 
) , all around the world, is a rare last name. The last name Armacost is characteristic of the United States, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname. Much less frequently, Armacost is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Armacost | Venezuela, Philippines, United States, Canada, New Zealand |
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michael armacost American diplomat (born 1937), US (b. 1937) |
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| wilbur h. armacost mechanical engineer and inventor (b. 1893) |
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tim armacost saxophonist and composer, US (b. 1962) |
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| richard ralph armacost America biology teacher and botanical collector (1914 - 1959 ), US (b. 1914) |
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andrew armacost U.S. Brigadier General |
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| samuel armacost American business executive/formerly president/director/CEO: Bank America Corporation, US (b. 1939) |
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| kira a armacost researcher |
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| david lee armacost Ph.D. Stanford University 1969 |
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| william louis armacost Ph.D. University of California, Los Angeles 1968 |
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| andrew paul armacost Ph.D. Massachusetts Institute of Technology 2000 |
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| austin armacost model (b. 1988) |
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