Cognomen Congdon (Congdon 
, 康登) , in the world, is quite a rare family name. The surname Congdon is characteristic of New Zealand, where it is quite a rare surname, the United States, and Australia. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
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| Congdon | United Kingdom, Australia, Canada, United States, New Zealand |
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henry martyn congdon American architect and designer, US (b. 1834) |
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caroline m. congdon American poet (b. 1841) |
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| elisha congdon American politician, US (b. 1799) |
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chester adgate congdon American politician (1853-1916), US (b. 1853) |
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| james m. congdon American politician, US (b. 1805) |
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frederick tennyson congdon Canadian politician (1858-1932), CA (b. 1858) |
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| elizabeth congdon (1831-1916) (b. 1831) |
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| charles t. congdon (b. 1821) |
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| joseph whipple congdon American attorney and plant collector (1834-1910), US (b. 1834) |
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| daniel keen congdon politician, GB (b. 1836) |
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elisabeth congdon American murder victim, US (b. 1894) |
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| marcus m. congdon American farmer and politician, US (b. 1844) |
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| thomas raphael congdon American painter, US (b. 1859) |
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| thomas edwin congdon (1882-1942) (b. 1882) |
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| anne ramsdell congdon US (b. 1873) |
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