der Armenier
Armenian man
A male person who comes from Armenia or is of Armenian descent.
Mein Nachbar ist Armenier und hat mir von seiner Heimat erzählt.
My neighbor is Armenian and told me about his homeland.

Armenian
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Armenian man
A male person who comes from Armenia or is of Armenian descent.
Mein Nachbar ist Armenier und hat mir von seiner Heimat erzählt.
My neighbor is Armenian and told me about his homeland.

The word 'Armenier' (Armenian man) is derived directly from the country name 'Armenien' (Armenia). This way of forming nationalities is very common in German.
Er kommt aus Armenien, er ist also Armenier.
He comes from Armenia, so he is Armenian.
When 'Armenier' (Armenian man) is used as a predicate noun to describe a nationality or origin, it normally appears without an article. This applies to many terms for professions and nationalities.
Wussten Sie, dass Charles Aznavour Armenier war?
Did you know that Charles Aznavour was Armenian?
The word family includes the country 'Armenien' (Armenia) and the adjective 'armenisch' (Armenian). You can use the adjective to describe things that have to do with the country or culture.
Ich interessiere mich sehr für die armenische Kultur.
I am very interested in Armenian culture.
Armenian
'der Armenier' and 'armenisch' both refer to Armenia, but grammatically they belong to different parts of speech. 'Der Armenier' is a noun and means a male person from Armenia or of Armenian descent. 'armenisch' is an adjective and describes something that belongs to Armenia, its culture, people, or language. Learners may confuse the words because they look similar. But you say 'ein Armenier' for the person and 'armenische Musik' (Armenian music), 'armenisches Essen' (Armenian food), or 'die armenische Sprache' (the Armenian language) for qualities or belonging.

Am Wochenende habe ich einen Armenier kennengelernt, der sehr gut Deutsch spricht.
At the weekend I met an Armenian man who speaks German very well.
Vor der Reise lernt sie ein paar armenische Wörter.
Before the trip, she is learning a few Armenian words.