Family name Treis (Trey 
, Treis 
) , in the entire world, is quite a rare surname. The last name Treis is habitual in Luxembourg, where it is quite a rare surname, Malaysia, and Jamaica. In absolute terms, the name is most common in Germany, Malaysia, and the United States. More frequently, Treis is the forename as well as the last name.
| tilmann von treis (1440-1505) (b. 1440) |
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| julius treis (1852-1927) (b. 1852) |
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| franz wilhelm xaver treis DE (b. 1857) |
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| josef treis (1895-1966) (b. 1895) |
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| theo treis (1935-2003) (b. 1935) |
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| robert treis Luxembourgish cyclist, LU (b. 1946) |
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| wolfgang treis DE (b. 1960) |
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| jim treis college basketball player (1955–1955) Marquette |
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| johannes treis German physicist |
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| tim treis researcher (ORCID 0000-0002-9686-4799) |
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| yvonne treis DE |
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| anna maria treis German association football player, DE |
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