Hmm...
Is there any possibilities that the crews of Gol D. Roger used their captain initial for their childs name? Or, maybe they changed their name to include the D. initial. Maybe Gol D. Roger passed his will to his trusted crews before he is captured. It's kind of suspicious to have people like Saul(Elbaf blood) having D. initials and is connected to Gol D. Roger just for that.
If so, there's a high possibility that Luffy will find some more people having D. initials. Hmm...
I'm just curious.
...and someday I'm gonna stay, but sorry not today...
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