'Notable' traces through Latin 'nota' (a mark) all the way back to PIE *gneh3- meaning 'to know.'
Worthy of attention or notice; remarkable. As a noun, a famous or important person.
From Old French 'notable' (well-known, remarkable, of note), from Latin 'notabilis' (worthy of being noted, remarkable), derived from 'notare' (to mark, to note, to observe), from 'nota' (a mark, a sign, a written character, a note in music). 'Nota' and 'notare' descend from PIE *gneh3- (to know — in its extended sense of making a mark by which something becomes known). The same root produced Latin 'notus' (known, familiar), 'cognoscere' (to come to know — source of 'cognition' and 'recognize'), 'ignorare' (to not-know — source of 'ignore'), Greek 'gignoskein' (to know — source of 'gnostic' and 'diagnosis'), and Germanic