(Anglo-Saxon, genoh or genog.) Enough! Stop now, you have said all that is needful.
French: “On est assez riche, quand on a le néessaire.” At one time Enow was used for numbers reckoned by tale, as: There are chairs enow, nails enow, men enow, etc.; but now enough does duty for both words, and enow is archaic.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894