Translations of the name Monts De Oca vary as do stories regarding the origin of the family.  Ancestry.com tells us it is “ Topographic name from a range of mountains forming the watershed between the rivers Ebro and Duero in northern Spain, named with the plural of monte ‘mountain’ and oca ‘goose’.”  The Urban Dictionary defines it as “large hills with an oak forest on top” or “large hills with geese on top”.