Cognomen Jr. (雷 
, جون 
, Jr. 
) , across the world, is a prevalent last name. The cognomen Jr. is habitual in Marshall Islands, where it is a common surname, Bermuda, and China (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in China, Myanmar, and Indonesia. Likewise, Jr. is the forename as well as the last name.
| nicolaas clopper jr. (b. 1432) |
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| krzysztof morsztyn jr. Polish educator (b. 1580) |
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| marcus de vogelaer jr. (b. 1589) |
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| adam mott jr. 21 Sep 1620 Saffron Walden, Essex - 5 Apr 1693 Portsmouth, Rhode Island (b. 1620) |
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| thomas mayhew jr. 1621–1657 , missionary and settler of Martha's Vineyard (b. 1621) |
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| joost de smeth jr. Dutch private banker, NL (b. 1626) |
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| joseph jenckes jr. founder of Pawtucket, Rhode Island, US (b. 1628) |
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| thomas price jr. (1635-1703), US (b. 1635) |
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| thomas stanton jr. (1638-1718) (b. 1638) |
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| ahasuerus fromanteel jr. Dutch scientific instrument maker and clockmaker (b. 1640) |
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| john kendrick jr. (1641-1721) (b. 1641) |
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| john catlin jr. 28 Jun 1643 Wethersfield, Connecticut - 29 Feb 1704 Deerfield, MA (b. 1643) |
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| capt. james morgan jr. 3 Mar 1644 Roxbury, Suffolk, MA - 8 Dec 1711 Groton, Connecticut (b. 1644) |
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| joseph parons jr. American businessman, US (b. 1647) |
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| thomas parke jr. 1648 - Bef 1699 (b. 1648) |
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