Aw, that's such a great thing to read! Congrats to the happy parents from me as well :)
I like the name and it totally fits with already having Indio. Both are town names but sound nice as a person's name as well.
Somehow the number 7 appears quite often: Indio was born on the 7th, so Exton Elias. Both brothers are exactly 7 months apart - from Februar to September :) And Exton's time of birth is 7:24...the first two numbers also fit the birth date.
I love such things :)