When Pedro Aguirre, Miguel Echarri was born about 1735, in Navarre, Spain, his father, Francisco Pedro Aguirre Oteyza, was 38 and his mother, Cathalina Miguel Echarri, Maiza, was 34. He married Lucía Bacaicoa Yriarte on 24 May 1762, in Etxarri Aranatz, Navarre, Spain. They were the parents of at least 1 daughter. He died on 24 November 1763, in Etxarri Aranatz, Navarre, Spain, at the age of 28.