13th cent. From Latin familia (legal) "family," but more commonly (and originally) "slave staff."
From Proto-Italic *famelias 'id.' A noun formed from an adjective *famelio- "domestic," "of the house," which dates back to a noun in Proto-Indo-European *dhh1-m-elo- "foundation" (see fámulo).
Romance: Western Vulgar Latin: Asturian familia, Portuguese família, Galician familia, Catalan família, French famille, Italian famiglia; Eastern Vulgar Latin: Aromanian fumealji, Romanian familie; Sardinian: famíglia
Italic: Oscan famelos "household," fml "slave," Umbrian fameřias "household," Paelignian famel "slave"
Indo-European: Hellenic: Ancient Greek θεμέλια (themélia) "foundation"