Does anyone know what the story is with aon ní ? Its incredibly similar to the English any, at also has a similar meaning, anything.

Is it a borrowing from English or is the similarity older due to both languages being distantly related indo-European ? Is the German "ein" similar ? Italian "ogni" Yiddish "abi" Dutch "enig".

Or am I just making it up ? Its been bugging me for months.

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Bíonn rudaí maithe mall

Aon = Old Irish spelling oen/oín it has different meanings depending on context .i.e only,unique,without equal, the same(today we use maraon for similar, alike, identical "Tá an dá theach maraon le chéile" . It is also used in Old Irish as an indefinite pronoun which is still used in modern Irish i.e 'An raibh aon duine ag an gcluiche ? '
ní comes from Old Irish indefinite pronoun meaning any,anything,something,thing, matter,item
ní , nithe(plural)
I am using my RIA Dictionary of the Irish Language which is the font of the language based on old texts and manuscripts which shows how the language has evolved from before the first millenium.

Aon isn't a pronoun there. It modifies duine and together they could be said to act as an indefinite pronoun. (In some varieties, written as a single word, i.e. éinne.)

Any derives from Proto-Germanic *ainagaz, which is *ainaz "one" with an adjective-forming suffix. So the first element is cognate (going back to Proto-Indo-European *óynos) but the remaining resemblance is coincidental. (The suffix most nearly corresponding to Proto-Germanic *-agaz is Proto-Celtic *-âkos, modern Irish -ach, cf. Eng. hearty, Ir. cairdeach.)

It's not impossible that the Irish usage was influenced by English, but it could also be an independent development.