The Manchego name, specifically, can only be traced as far back in time as the 1700s and only in New Mexico. My data begins with a Manuel Pedro Manchego around 1750 and his descendents. It is the wives of his descendents that have left a better trail through which their ancestors migrated into New Mexico with Onate's entrada. Where and when the Manchego name arrived has not yet been determined.
Are you in the US ???There are many Manchego descendents in New Mexico, Colorado, and California.