Would it be weird if siblings had the similar pronunciations to the end of there names (example in question)?

There are cultures/languages where all or almost all names for one genre end in the same letter - for instance almost all Latvian boys names end in an S. So no, it's not weird.

I am one of three sisters that all have 1) names that start with K's, 2) first and middle names that all end in short "a" sounds, and 3) names that have generally 3 syllables and are spelled differently than most people would think. We all love our names but other people have had problems with them all of our lives, things like being called each others' names (and anybody else's that sounds kinda similar) & being told that we're misspelling/mispronouncing our own names. For the sake of others we have alias' to make things easier, names like Kay and Betty. Sometimes it's easier when names are less clever and/or meaningful, epecially when kids are close in age.

Its a pet peeve of mine for siblings name to start or end in the same sound/letters...I think its ok if its 2, MAYBE 3 kids, but after that it gets cheesy and wierd.

ex- Hanna and Emma is fine. Hanna, Emma and Tessa is still fine. Hanna, Emma, Tessa and Noah is a bit wierd.

Yes.