The Spanish verb 'variar' (meaning 'to vary') comes from the Latin verb 'variare', which meant 'to change' or 'to diversify'. This Latin verb was derived from the adjective 'varius', meaning 'varied' or 'diverse'. The evolution from Latin to Spanish maintained both the form and meaning quite closely, with just minor phonological changes typical of Spanish development from Latin words.

Several common Spanish words share this Latin root, including 'vario' (various), 'variedad' (variety), 'variable' (variable), and 'variación' (variation). All these words maintain the core concept of change, diversity, or variation that was present in the original Latin terms.

English speakers can easily connect 'variar' to several similar English words that share the same Latin ancestry, such as 'vary', 'various', 'variety', and 'variable'. The similarity in both form and meaning makes this connection particularly straightforward, as these English words also came from Latin 'varius' and 'variare', though they entered English through Old French.