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Apparently that was Vance’s birth name.
James Donald Bowman
And Bowman Vance has a son named Vivek.
What is it with this guy and smarmy politician names?
So he was born James Donald Bowman (Donald!).
Then when he was 6 he became James David Hamel.
Then later (after 12?) he became James David Vance (his mother's maiden name).