Worldwide, Heydon (Heydon 
, Хейдон 
) is a rare masculine forename. The first name Heydon is habitual in the Democratic Republic of the Congo, where it is a rare masculine name, and the United States, where it is an extremely rare unisex name. More prevalently, Heydon is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Heydon | Australia, France, United Kingdom, United States, Democratic Republic of the Congo |
| Хейдон | Ukraine |
| sir john heydon (1468-1550) (b. 1468) |
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| sir john heydon English Royalist military commander and mathematician (b. 1588) |
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| dyson heydon Australian judge, AU (b. 1943) |
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| sir john heydon Peerage person ID=175280 |
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| sir christopher heydon - 1540 (dvp) |
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| sir christopher heydon Peerage person ID=25296 |
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| sir john heydon Peerage person ID=26901 |
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| sir christopher heydon, of baconsthorpe - 10 Dec 1579 |
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| sir henry heydon Peerage person ID=17353 |
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