Lumpy and cylindrical, the burrito takes its name, according to one theory, from the bedroll that Mexican miners and travelers would drape across the saddle of a donkey, or burro in Spanish. Another possible origin suggests that street vendors sold burritos from baskets attached sidesaddle to their burros, the conveyance transferring its name to the thing conveyed.
or just smaller than a donkey
I looked it up in the britannica
Lumpy and cylindrical, the burrito takes its name, according to one theory, from the bedroll that Mexican miners and travelers would drape across the saddle of a donkey, or burro in Spanish. Another possible origin suggests that street vendors sold burritos from baskets attached sidesaddle to their burros, the conveyance transferring its name to the thing conveyed.