There are numerous approaches for choosing "matching" names for siblings. Here are a couple that I've encountered irl:
1. same initial letters
2. (kind of ) alphabetically, FGH for example
3. thematically - novel characters
Obviously people choose the names they like, but these are generic themes that can be found in naming siblings. Do you care about matching names of a sibset? Would you choose names with the same initial letter/initials?
I've seen this a couple times and think that it can be cute if done right (when choosing different vowel combinations and name lengths for example).