Last name Erby (Erby 
) , all around the world, is quite a rare surname. The surname Erby is habitual in Slovakia, where it is quite a rare surname, the United States, where it is a rare surname, and Australia. In absolute terms, this name is the most popular in the United States, Indonesia, and Italy. Likewise, Erby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Erby | Haiti, Italy, United States, Slovakia, Indonesia |
| arthur erby Australian rugby union player, AU (b. 1902) |
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| elemír erby Esperantist, SK (b. 1929) |
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| hazel erby American politician, US |
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| michael erby college basketball player (1984–1985) Alabama State |
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| lori erby researcher |
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