Cognomen Elfer (Elfer 
) , across the world, is a rare last name. The last name Elfer is habitual in Peru, where it is a rare surname, Honduras, and Myanmar, where it is a very rare surname. In absolute terms, it is the most numerous in the United States, Peru, and Myanmar. More prevalently, Elfer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Elfer | Myanmar, Peru, Philippines, United States, Guatemala |
| elfer aladár HU (b. 1877) |
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| david elfer British QC and judge (1941-2020), GB (b. 1941) |
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| helmuth elfer German Nazi concentration camp inmate, block elder in Ebensee concentration camp |
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| menuha elfer Victim of the Holocaust |
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