From Latin 'denominare' (to name completely) — connecting the act of naming to currency, fractions, and religious groups.
To give a name to; to call by a specific name or designation; to express (a sum of money) in a specified monetary unit.
From Latin dēnōmināre (to name, to designate, to call by name), from dē- (completely, down from) + nōmināre (to name, to nominate, to call), from nōmen (name), from PIE *h₁nómn̥ (name). The PIE root *h₁nómn̥ is one of the best-attested in the family, present in virtually every branch: Sanskrit nāman, Greek onoma (ὄνομα), Latin nōmen, Old English nama, Gothic namo, Old Irish ainm, Armenian anun — all meaning name. The completeness prefix dē- gives denominate the sense of naming fully or officially designating. In mathematics
The word 'denominator' in mathematics literally means 'the namer' — the bottom number in a fraction names what kind of parts you are counting. In 3/4, the denominator '4' names the parts as quarters, and the numerator '3' counts them.