Cognomen Rudrum (Rudrum 
) , in all the world, is a rare last name. The surname Rudrum is habitual in the United Kingdom, where it is a rare surname, Australia, and New Zealand. Not in comparison with a country's population, it is the most numerous in the United Kingdom, Australia, and Canada. Very seldom, Rudrum is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rudrum | Australia, Canada, New Zealand, United Kingdom, Netherlands |