Family name Leffingwell (Leffingwell 
) , all over the world, is quite a rare last name. The surname Leffingwell is habitual in the United States, where it is a rare surname, Canada, where it is a very rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in the United States, Canada, and Brazil.
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| Leffingwell | Canada, United Kingdom, United States, Brazil, New Zealand |
| naomi leffingwell 8 Nov 1638 Cambridge, MA - 28 Mar 1681 Reading, MA (b. 1638) |
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| rachel leffingwell 2 Mar 1654 Woburn, MA - 1718 Framingham, MA (b. 1654) |
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| anne leffingwell 25 Jan 1680 Norwich, Connecticut - Abt 1762 (b. 1680) |
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christopher leffingwell 1734-1810 , businessman and civic leader (b. 1734) |
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| samuel leffingwell May 1692 - 6 Aug 1753 (b. 1692) |
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| sarah leffingwell 13 Feb 1699 Norwich, CT - 1 Apr 1770 (b. 1699) |
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ruth webster perit leffingwell (1755-1840) (b. 1755) |
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| lydia leffingwell (1706-1766) (b. 1706) |
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sally beers leffingwell (1765-1830) (b. 1765) |
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william leffingwell (1765-1834) (b. 1765) |
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| lydia leffingwell 6 May 1773 Norwich, Connecticut - 6 Mar 1809 (b. 1773) |
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charles wesley leffingwell American writer and priest, US (b. 1840) |
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albert leffingwell American physician, US (b. 1845) |
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frank s. leffingwell Canadian politician (1868-1945), US (b. 1868) |
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ernest de koven leffingwell American geologist and explorer (1875-1971), US (b. 1875) |
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