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What is it called when a person has the exact same first and last name (and same spelling), whether named by parents or as a result of marriage? For example, Thomas Thomas.

coleopterist
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They are very likely informally termed tautonyms or as the Wikipedia page tells me, linguistically called reduplicants. There's a page full of people with reduplicated names including:

  • José José
  • Justo Justo
  • Kelly Kelly
  • Lisa Lisa
  • Thomas T. Thomas

The term is not used solely for names with reduplicated first and last names, but also for other variants such as Jar Jar Binks or Richie Rich.

coleopterist
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