WordReference Random House Unabridged Dictionary of American English © 2020
middle name, 
  • the part of a person's name occurring between the first and family names, as a second given name or a maternal surname.
    • 1825–35, American.

    Collins Concise English Dictionary © HarperCollins Publishers::
    middle name n
    1. a name between a person's first name and surname
    2. a characteristic quality for which a person is known: caution is my middle name
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