Reddit reviews Encyclopedia of Goddesses and Heroines [2 volumes]

You know what? I am absolutely convinced that you've already attempted to look up her origins, and have found multiple mentions of her being an Irish god. I'm willing to bet you have absolutely no need for me to provide you with sources, and are just clinging on to hope that I won't provide sources, just so you can somehow "win" the argument. But fuck it, this is a fantastic mythology full of beautiful writing, so I'll compile some links for my own personal use to share with others while also showing you here...

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Her name is an Irish name, so that's a good place to start.

The Morrigan is a triple-deity, all three deities also being Irish. Babh (the Irish word for "crow"), Irish goddess Anu, and then Macha, another Irish word. One of the better books on the subject of the three would be this.

Her "race", for want of a better word, is that of the Tuatha dé Denann (more Irish words), and after a good 5 mins of searching I've found a few dozen references to them as being Irish, and not one suggesting otherwise.

To add to this, the only reason she is notable above any other god is her association with the Hercules of Irish mythology, Cú Chulainn (The Irish for "Hound of Chullainn). The most well known image of The Morrigan is that of her in crow form over his dead body, after previously warning him of his impending death. Not so much relevant to examining her origins, but just adding even more connections with Ireland to build on the sources you're pretending to need.

You want some more books to read? Try this, this, this, or these.

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Now obviously these sources vary in their usefulness, I personally despise using Wikipedia as a source, but I'm not here to do your homework, that's what's convenient for me right now. What I've provided are multiple instances of The Morrigan being referred to as Irish, to the Irish etymology of her name, and the Irishness of other gods associated with her.

I could link to about 100 more books, a dozen more wikipedia entires, or thousands of online references of varying usefulness, all of which refer to her as an Irish goddess, but as I've already established, I am not offering contrarian opinions that differ from the accepted knowledge of scholars and regular Irish folk who were brought up on this stuff. That would be you, the one demanding sources for accepted knowledge while not providing anything to suggest otherwise.

I have no doubt that you will read these sources and become an expert on Irish mythology in the days to come. You are sincerely welcome.