What does An gra feinmharu mean?

"An gra feinmharu" is not standard Irish. It seems to be a misspelling or a non-standard construction. The likely intended meaning depends on the intended spelling. Possible interpretations, depending on the intended words, include:

* An grá féinmhúir: This *might* be attempting to say something like "self-love," or "love of oneself," but it's not grammatically correct. The word "féinmhúir" doesn't exist as a single word in Irish.

* A ngrá féin mhúir: This is also grammatically unlikely, but *could* be a badly formed attempt at something similar to the above.

To get a correct translation, you'd need to provide the correct spelling or more context.