Sancho

The name Sancho () is an Iberian name of Basque origin (Santxo, Santzo, Santso, Antzo, Sans). Sancho stems from the Latin name Sanctius. Feminine forms of the name are Sancha, Sancia, and Sanchia ()m and the common patronymic is Sánchez and Sanches.
Outside the Spanish-speaking world, the name is especially associated with the literary character Sancho Panza.
Sancho is a common slang term in the Spanish speaking world for the other man in the relationship. As in a... plus