J.D. or JD? Bowman Then Hamel Now Vance. What to Know About the VP Candidate's Names
Briefly

His mother's marriage led to a name change to James David Hamel, omitting the biological father's name, Donald Bowman, ultimately shaping the name JD Vance.
Vance adopted the name J.D. from James David J.D. Hamel, reflecting continuity in his initials despite several name adjustments over his life.
Read at time.com
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