The Spanish word 'moño', meaning 'bun' or 'topknot', comes from a Pre-Roman root '*munn-' that meant 'bulge' or 'protuberance'. This etymology makes intuitive sense, as a hair bun creates a rounded protrusion on the head. The word evolved from describing any kind of bulging shape to specifically referring to the rounded shape created by gathering and coiling hair.

A related Spanish word is 'moñudo', meaning 'having a crest or topknot', which is often used to describe birds with distinctive feather tufts on their heads. Another related term is 'moñito', a diminutive form meaning 'small bun' or 'bow'.

While there aren't direct English cognates from this Pre-Roman root, English speakers might find it helpful to think of the word 'mound' as a conceptual parallel, since both words relate to a rounded protrusion, though they have different etymological origins.