Hennessy is an uncommon yet distinctive given name of Irish origin, derived from the surname 'O' Haining'. It means 'fire' or 'flame', reflecting its ancient Celtic roots and the fiery spirit it was once believed to embody. The name gained significant recognition due to its association with the prestigious French cognac brand established by the Hennessy family in the 18th century.
The name Henessy saw a significant rise in popularity between 2005 and 2009, with the highest number of births recorded in 2009 (14 births). However, there has been a consistent decline since then, with only 5 births registered in 2019. Over these years, a total of 162 babies were named Henessy.