What the title says: is it "a óinseach"?

GRMA!

Redwolf

A óinsigh!

According to the Cork Irish Dictionary: the vocative óinsigh reflects a tendency for the declension of feminine nouns in -ch to align with masculine nouns.

Yes but I guess it's only in Cork Irish
Elsewhere: a óinseach!

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

That is what I'd say.
I suppose we do genitive differently in Conamara.

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It is recommended that you always wait for three to agree on a translation.
I speak Connemara Irish, and my input will often reflect that.
I will do an mp3 file on request for short translations.
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a óinseach!

I would say also.

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Bí cinnte de go nglacfaidh triúr le gach aistriúchán a thabharfar.
Be sure to get three in agreement with a translation given.

As WeeFalorieMan said in Munster some Feminine nouns used to refer to women, positively or negatively, act like Masculine nouns in the vocative. This extends to their adjectives
as well:

A thoice bhig! = You little thing!
A óinsigh mhóir! = You moron!

Elsewhere though, as everybody else has said, you still have the traditional vocative.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

Thanks for clarifying this – it helps a lot!

óinseach would become " a óinsigh" in Munster, but the vocative is fading really fast out of the spoken language here.

Ollamh....a ollaimh

Mícheál...a Mhichíl

Cíarán...a Chíaráin

Traolach...a Thraolaigh.