From Latin 'familiaris' (of the household), from 'famulus' (servant) — originally 'belonging to the household,' then 'well-known.'
Well known from long or close association; often encountered or experienced.
From Old French familier (familiar, intimate, domestic), from Latin familiāris (of a household, domestic, intimate), from familia (household, family, servants of a household), from famulus (servant, attendant), of uncertain pre-Latin origin, possibly from Oscan or another Italic dialect. The core semantic journey moves from spatial proximity to psychological intimacy: a familiāris person was one who shared your roof, and sharing space breeds knowing. The PIE root proposed for famulus is *dʰeh₁- (to set, to place), via the idea of those placed in the household. The noun
The Latin 'familia' did not mean 'family' in the modern sense — it meant 'the household servants' collectively. A Roman 'familia' included all the slaves and dependents under one master's authority, not the blood relatives specifically. The word comes from 'famulus' (servant). So 'familiar' originally meant 'like a household servant' — someone you