No. David Tennant is just a stage name. His real name is David
McDonald but he had to change his name because there was another
actor named David McDonald when Tennant entered the industry.
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Christy Tennant's birth name is Christine Alice Tennant.
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Neil Tennant's birth name is Neil Francis Tennant.
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Pauline Tennant's birth name is Pauline Laetitia Tennant.