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Cognomen Thaddeus (Thaddeus
, Фадей
, Таддеус
) , all over the world, is a common last name. The cognomen Thaddeus is habitual in Nigeria, where it is quite a rare surname, Malaysia, and Cameroon. Measured by absolute frequency, the name is most common in Nigeria, Malaysia, and Kenya. Likewise, Thaddeus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thaddeus | Kenya, Malaysia, United States, Philippines, Nigeria |
| Фадей | Ukraine, Russia, Belarus, Kazakhstan |
| Таддеус | Armenia |
| Тадеус | Ukraine, Russia |