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From earlier usa, from Old Irishassu. Similar to development of fuar and feic, the initial f- of Modern Irish comes from a misinterpretation of usa as fhusa in lenition environments.
fusa in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)