I used to love it, and we considered it when we were expecting our first (we are NOT Irish at all).
I have met a few and it doesn't scream Irish, but it does have a solid and handsome feel. I also have not met many.
If you are not into it though, I would keep looking until you find something you both like.
There are tons of names with similar feels to
Declan, it just depends on what your husband likes about the name.
If you give us some parameters we would have a hayday throwing out suggestions.
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Mama to my pretty Nin (Nadine Marikit) and my Clarybee (Clarisse Bituin). Mahal na mahal from our little family to yours!