The Spanish word 'manta' (meaning 'blanket') traces its origins back to the Latin word 'mantum', which meant 'cloak' or 'mantle'. This evolved through the diminutive form 'mantellum' (meaning 'short cloak') in Latin. In Spanish, it first appeared as 'manto' (meaning 'cloak' or 'mantle'), and then developed into 'manta', with its meaning shifting from a wearable cloak to the more general concept of a blanket or covering.

A closely related and common Spanish word is 'manto', which still retains its original meaning of 'cloak' or 'mantle'. While 'manto' refers specifically to a garment that is worn, 'manta' broadened its meaning to include any fabric covering used for warmth or protection.

English speakers might recognize the connection to the word 'mantle', which comes from the same Latin root 'mantum'. While 'mantle' in English can refer to a cloak or covering, it has also taken on additional meanings such as 'a covering layer' or metaphorically 'to take on a role or responsibility' (as in 'to take on the mantle of leadership'). The English word 'mantilla', a type of light lace or silk scarf worn by women, is also related, having been borrowed directly from Spanish.