The Spanish title of respect 'don' traces back to the Latin word 'domus' meaning 'house'. From this root developed the Latin word 'dominus' meaning 'lord' or 'master' (literally the master of the house). The vocative form of 'dominus' was 'domine', which was used when directly addressing a lord or master. This form eventually evolved into the Spanish 'don', which is used as a respectful title before a man's first name, similar to 'Mr.' or 'Sir' in English.

Several common Spanish words share this same Latin root 'domus' meaning 'house'. For example, 'dueño' (owner) comes from 'dominus', and 'domicilio' (residence, domicile) directly relates to 'domus'. The word 'doméstico' (domestic) is another clear descendant showing the connection to household matters.

Many English words share the Latin root 'domus' and 'dominus'. 'Dominate' and 'dominion' come from the idea of having mastery or lordship over something. 'Domestic' relates to the household, while 'domicile' means a place of residence. Even the word 'dame' (which came through French) is ultimately related, originally referring to the lady of the house.