I got this from a discussion elseforum:

In the Irish Republic, English and Gaelic (Irish dialect) are co-equal
official languages. Your name in English is considered the same as your
name in Gaelic, and you may request official documents (such as passports
or driver's license) in either name. Thus, the gentlman that introduces
himself as "John Smith" may well be in perfectly legal possession of ID in
the name "Seán Mac Gabhann".

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