In some editions of Hyginus' Fabulae, Leuconoe was the suggested reading for the name of the child of Poseidon and Themisto. The reading Leucon has been accepted as more appropriate.
In Roman literature, Leuconoe is a figure to whom Horace's Ode 11 of Book 1 of Odes is addressed.
Hesiod, Catalogue of Women from Homeric Hymns, Epic Cycle, Homerica translated by Evelyn-White, H G. Loeb Classical Library Volume 57. London: William Heinemann, 1914. Online version at theio.com