I agree. I abhor alliterative naming.
Now, if your favorite names are
Samuel and
Susannah, and they are brother and sister, that is one thing. Do it.
But if you have
Samuel and
Susannah, and then want to have a
Benjamin, but don't name him what you want because you already have two S's, settling for
Stephen, then I don't really think you're cool.
Having each child with their own different first letter is much cooler.

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