Hi, could someone tell me if I have the correct translations here. I found these on Google translate (stop cringing). I'm creating a poster and I want to say, "The Morrigan is the Raven," The Raven is the Morrigan." Are the following the correct translations? Is an t-Morrigan an fiach dubh, is é an fiach dubh an Morrigan. Any help would be great, thanks so much.

Morrígan is Old Irish. (mor = mare, rígan = queen)

The name is spelled Mór-Ríon in Modern Irish (Mór with accent because the name was reinterpreted as "great queen")
With the article it is an Mhór-Ríon

Is í an Mhór-Ríon an fiach dubh. = The raven is the Morrígan. / The Morrígan is the raven.

I wouldn't change the order in Irish to Is é an fiach dubh an Mhór-Ríon for "The Morrígan is the raven", because proper names come usually first in such sentenes, no matter what is the intended meaning.

Thanks so much for your reply. This is for a poster so the text is pretty much a graphic element. One line at the top and the other balanced out at the bottom. Would it still make sense if I used the Raven is the Mhór-Rion line? In that order.

If you want to contrast them perhaps try using is ea?

An Mhór-Ríon is ea an fiach dubh
An fiach dubh is ea an Mhór-Ríon

?
It sounds a bit odd to me but it may be a possibility. Perhaps Labhrás can inform us.

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Yes, thank you. That's more what I was going for. Hopefully it's grammatically correct.

is ea is used in classification sentences only (i.e. with an indefinite noun)
Fiach fubh is ea an Mhór-Ríon = The Morrígan is a raven.
Mór-Ríon is ea an fiach dubh = The raven is a Morrígan. (which doesn't make much sense.)

In identification sentences (i.e. with two definite nouns) is é (or is í, is iad respectively) could be used instead.
But it is rare, I think. I don't know if anybody would say so.
An fiach dubh is é an Mhór-Ríon. = The M. is the raven
An Mhór-Ríon is í an fiach dubh. = The raven is the M.

Thank you both so much for your time and patience. This has been very helpful. Thanks again.

According to GGMB and yer man Nolan this is an emphatic form, and all the examples given
involve relative clauses: 'An fiach dubh is é a + verb'.

An example I read in GGBC has double é (subpredicate and subject): Carl Marstrander ba é é. (I'm curious about the pronunciation, perhaps an extra long /e/-sound. )
I think I've seen examples elsewhere with two nouns but I don't remember exactly where.

Oops! Is fíor duit. Is cuimhin liom an ceann sin a fheiceáil.

("O' Nolan" ba cheart domh a rá ar ndóigh.)