Gennessy is of French origin, derived from the Germanic element 'Genisc', which means 'spear'. It was popular during the Middle Ages but has since become quite rare. The name Gennessy is often associated with a strong and determined character, reflecting its meaning. In some instances, it may also have been used as a variant of the French name Genessay or the Italian name Gennessei.
"Gennessy is a rare name with only five births recorded annually in 2006."