Last name Cay (凯 
, Cayo 
, Cay ) , in the entire world, is a widespread family name. The family name Cay is characteristic of Bolivia, where it is quite a common surname, China, and Peru. More frequently, Cay is the forename as well as the last name.
| john cay English barrister and legal writer (b. 1700) |
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robert hodshon cay (1758-1810) (b. 1758) |
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john cay Scottish advocate, photographer and antiquarian (b. 1790) |
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| clementina cay (1764-1841) (b. 1764) |
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william dyce cay civil engineer, GB (b. 1837) |
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| frances cay (died 1839) (b. 1792) |
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| robert dundas cay (1807-1888), GB (b. 1807) |
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| john cay (1820-1892) (b. 1820) |
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| emily cay (1827-1904) (b. 1827) |
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| elizabeth cay (born 1828) (b. 1828) |
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| lucy cay (1829-1883) (b. 1829) |
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| albert cay (1846-1921), GB (b. 1846) |
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| albert jaffray cay British soldier (b. 1880) |
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| edward cay Peerage person ID=31519 |
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| clare cay (died 1936) |
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