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Across the world, Cardiff (Cardiff
, Caer
) is a very rare predominantly boy's, but very seldom female first name. The first name Cardiff is habitual in South Africa, where it is a very rare male name, the United States, where it is a very rare mostly boy's, but infrequently female name, and Philippines, where it is an extremely rare boy's name. More frequently, Cardiff is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Cardiff | Canada, France, Ireland, United Kingdom, United States |
| Caer | Belgium, Canada, France, United States, United Kingdom |
Cardiff is also a name for the fictitious and mythical characters: .