It's a modern choice.
I like it.
Adalyn does sound a bit like "madelyn" without a "M" to me. Sadly a bit like Elodie- which as much as I love it sounds like Melody.
I think you may get spelling troubles- Adelyn, Adeline, Adaline etc
Possibly pronounciation issues- I would say it as "ad-a-lyn" but a PP thought it was ADA-lyn
That said, I like it.
I have a soft spot for Mackenzie too. Agree on the 'c'.
Lovely choice - goes well with your other sons names and fits your style well :) I would personally spell it Adeline Mackenzie but that is just personal preference.
P.S if you are worried about pronunciation - which is why some people choose the Adalyn spelling - think Madeline - rhymes with Adeline, I think people would pronounce it just as easily :)
We are wanting the Add-a-lyn pronunciation. I like the spelling Adeline but I do not want the "line" ending. I'm not picky on the Makenzie thing I have no problem with Mackenzie.