Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
RIORDAN
There are approximately 2,475 people named Riordan in the UK. That makes it the 3,810th most common surname overall. Out of every million people in the UK, approximately 39 are named Riordan.
Region of origin
British Isles
Country of origin
Ireland
Language of origin
Gaelic
Religion of origin
Christian
Classification
Celtic
Related and similar surnames
ReardonRearden
Riordon
Riordann
Riordane
Riordean
Riordain
Riordans
Riiordan
Riardan
Rieordan
Riordian
Rioradan
Raiordan
Reordan
Reiordan
Riorda
Reierdan
Reeordan
Riordam
Reairdan
Reoardan
Reirdan
The Riordan surname in historical dictionaries
Patronymica Britannica (1860)
RIORDAN. An old Irish siu-name, variously written O'Rierdon, Reyrdon, Reardon, Reardcn, &c.