der Ire
Irishman
A male person who comes from Ireland or has Irish citizenship. The female form is 'die Irin' (Irishwoman).
Der Sänger der Band ist ein Ire aus Dublin.
The singer of the band is an Irishman from Dublin.

Irishman
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Irishman
A male person who comes from Ireland or has Irish citizenship. The female form is 'die Irin' (Irishwoman).
Der Sänger der Band ist ein Ire aus Dublin.
The singer of the band is an Irishman from Dublin.

'Der Ire' (the Irishman) belongs to the N-declension. This means that the word gets an '-n' at the end in the accusative, dative, and genitive singular. Only in the nominative singular does it remain without '-n'.
Ich habe gestern einen Iren kennengelernt.
I met an Irishman yesterday.
This word belongs to a word family. The country is called 'Irland' (Ireland), and the corresponding adjective is 'irisch' (Irish).
Er ist Ire und liebt irische Musik.
He is Irish and loves Irish music.
Careful: the female form 'die Irin' (the Irishwoman) does not follow the N-declension. It is declined like a normal feminine noun.
Ich spreche mit dem Iren.
I am speaking with the Irishman.
Briton
'der Brite' and 'der Ire' refer to men from different countries or with different citizenship. 'der Brite' comes from Great Britain or has British citizenship. 'der Ire' comes from Ireland or has Irish citizenship. The words can be confused because Great Britain and Ireland are geographically close to each other and both can belong to the English-speaking world. For choosing the right word, however, origin is what matters: Great Britain is not the same as Ireland.

Beim Fußballtraining spielt ein Ire mit, der aus Dublin kommt.
An Irishman from Dublin plays with us at football practice.
Der Brite erzählte im Zug von seiner Familie in London.
The Briton talked on the train about his family in London.