What are common terms of affection used?

Hey everyone. I plan on proposing to my long term girlfriend and have a question. Her family is from Cork and while most of her life has been spent state side, she tries very hard to stay connected to her non American heritage. I wanted to get something enscribed on the band of our rings, but I also wanted to make sure it was actually something said/used. I could google it, but it's kinda hard to tell what's actually really said to what people think is said if you know what I mean.

So! Are there any common terms of affection used? I've seen things like Mo chuisle, but like I said I wasn't sure how true that actually is.