Last name Bayer (Bayer 
, باير 
, 拜尔 
, and others...) , all around the world, is a common surname. The family name Bayer is habitual in Vanuatu, where it is a common surname, Austria, where it is quite a common surname, and Germany (explore the name in all countries). In absolute terms, it is commonest in Germany, the United States, and Turkey. Much less frequently, Bayer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Bayer | Austria, Germany, Philippines, United States, Turkey |
| باير | Iran, Iraq, Jordan, Palestinian Territory, Syria |
| 拜尔 | China |
| Байер, Баер | Kazakhstan, Russia, Ukraine, Kyrgyzstan |
| באייר | Israel |
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ludwig der bayer Duke of Bavaria and Holly Roman Emperor, DE (b. 1282) |
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andreas bayer German jurist, DE (b. 1566) |
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johann bayer German astronomer, DE (b. 1572) |
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| nicolaus bayer DE (b. 1548) |
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| andreas bayer DE (b. 1594) |
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| david bayer DE (b. 1607) |
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| ján bayer Slovak poet, philosopher and writer, SK (b. 1630) |
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| pavel ignác bayer Czech architect, CZ (b. 1656) |
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| philipp jacob bayer (b. 1649) |
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| johann bayer DE (b. 1666) |
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| jakob bayer DE (b. 1673) |
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| matthäus bayer (b. 1685) |
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| benedictus bayer CZ (b. 1686) |
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| johann georg bayer (b. 1695) |
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| andreas bayer (b. 1710) |
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