Surname Ciardha (Ciardha 
) , globally, is a very rare family name. The surname Ciardha is habitual in Ireland, where it is a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States.
| VARIANT | COUNTRY |
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| Ciardha | United States, Ireland, United Kingdom |
| caoilte ó ciardha researcher ORCID ID = 0000-0001-5383-8403 |
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| pádraic ó ciardha Irish journalist, IE |
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| pádraig ó ciardha Irish radio broadcaster, IE |
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| éamonn ó ciardha Irish historian |
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| mícheál ó ciardha Irish radio broadcaster, IE |
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| mártan ó ciardha IE |
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| osgur ó ciardha IE |
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