The Spanish verb 'mojar' (meaning 'to wet' or 'to moisten') traces its origins back to the Latin word 'mollis', meaning 'soft' or 'tender'. This evolved into the Latin verb 'mollire' meaning 'to soften', which then developed into the Vulgar Latin 'molliare', meaning 'to soften' or 'to moisten'. The connection between softness and moisture makes intuitive sense - things that are wet often become softer. Over time, as the word evolved into Spanish 'mojar', it specialized to focus specifically on the action of wetting or moistening something.

A related Spanish word is 'mojo' (sauce), which comes from the same root - it refers to a liquid sauce or marinade used to moisten food. Another related word is 'mojado' (wet), which is the past participle of 'mojar'.

The English word 'mollify', meaning 'to soften in feeling or spirit, to appease', comes from the same Latin root 'mollis'. While 'mojar' developed to refer to physical moistening, 'mollify' evolved to describe emotional or metaphorical softening. The English word 'mollient' (something that softens or soothes) is another related term, though it's less commonly used.