Surname Ruadh (Roy 
, Ruadh 
) , worldwide, is a prevalent cognomen. The last name Ruadh is habitual in Bangladesh, where it is a common surname, India, and Israel (explore the name in all countries). Not in comparison with a country's population, it is commonest in India, Bangladesh, and the United States. Much less frequently, Ruadh is the forename as well as the last name.
| feidhealm ruadh 5th-century saint and daughter of Lóegaire mac Néill, king of Tara, who was baptised by St. Patrick (b. 500) |
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| calum ruadh bard and crofter, GB (b. 1902) |
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