To me they have different pronounciations
Madeline - Mad-eee-line (last syllable is line, like straight line)
Madalynn - Mad-uh-lyn

Hope that's clear!FWIW, I prefer the first spelling and pronounciation
I love Tabitha, that was on my list for DD. Eladia looks beautiful - how do you say it - E-laa-de-uh? or Eee-lay-de-uh?

Good luck, hope I was some help!
Thanks Yep...gotcha I know what you mean by the spellings make pronounciation sound different. I prefer the Madalyn pronounciation.

Eladia with english pronounciation would be, as you say E-Laa-de-ah, but the Spanish pronounciation is E-la-thi-ah. I love it too....