Family name Welz (Welz 
, Вельц 
) , around the world, is quite a common last name. The last name Welz is habitual in Western Europe, particularly Germany, where it is quite a rare surname, Austria, and Switzerland. In absolute terms, it is the most numerous in Germany, the United States, and Austria. Very seldom, Welz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Welz | Austria, Germany, Poland, United States, Switzerland |
| Вельц | Kazakhstan, Ukraine, Russia, Kyrgyzstan |
| maria magdalena welz (b. 1554) |
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| bernhard von welz (b. 1573) |
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| ferdinand von welz DE (b. 1584) |
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| justinian von welz Austrian nobleman, AT (b. 1621) |
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| siegmund moritz welz (b. 1619) |
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| thomas von welz (b. 1654) |
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| giuseppe de welz Italian philologist, economist and Catholic priest (1774-1841), IT (b. 1774) |
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alois welz CZ (b. 1821) |
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| robert von welz German physician and ophthalmologist, DE (b. 1814) |
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| louise von welz (b. 1827) |
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| robert ritter von welz (b. 1832) |
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| eugenia welz CH (b. 1833) |
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| carl welz German painter (1860-1929), DE (b. 1860) |
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| eduard von welz (b. 1854) |
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| bedřich welz CZ (b. 1866) |
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