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Last name origins & meanings:

  1. Spanish and Portuguese: from a personal name of uncertain, possibly pre-Roman, origin.
  2. Lieutenant of Engineers Romualdo Pacheco, a native of Guanajuato, Mexico, went to CA in 1825 as an aide-de-camp to Governor Echeandía. His son. also called Romualdo Pacheco was born in 1831 in Santa Barbara, CA, and went on to become governor of CA.