Cognomen Ludlum (Ludlum 
) , worldwide, is quite a rare last name. The surname Ludlum is characteristic of Jamaica, where it is a rare surname, the United States, and New Zealand. In absolute terms, it is the most numerous in the United States, Indonesia, and the United Kingdom.
| VARIANT | COUNTRY |
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| Ludlum | Philippines, Jamaica, United Kingdom, United States, Indonesia |
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frances ludlum (1766-1852) (b. 1766) |
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| david m. ludlum American meteorologist, historian (1910-1997), US (b. 1910) |
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| robert ludlum American novelist (1927-2001), US (b. 1927) |
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| alia m. ludlum United States federal judge, US (b. 1962) |
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| jennifer ludlum graduate of QEII Arts Council Drama School in 1970 |
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| stuart ludlum college basketball player (1960–1962) Yale |
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| elizabeth ludlum |
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| robert ludlum |
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