I'm not a huge fan of it my nieces and sil all start with D
I live in an area where it's been very popular to do this. My sil and her siblings are all named with the letter A to start. I'm not a fan of it though. It narrows down the choices too much.
To each their own. A friend of mine has 4 girls all within 5 years of each other. All their names start with "K". I don't think it is for me but they like it. My kids so far all have different first letters.
My older 2 are Emma and Ethan. My youngest is Aiden, and DH likes Adalyn or Addysen for a girl.
my kids have the same initials J.A.J.
My girls' names both start with A's. I did it on purpose. The only trouble is if I have another girl and can't come up with a good A name.
My siblings and I all have names that start with M. All 4 of us.