A spelling variation of Hennessy, from an Irish surname meaning descendant of Aonghus.
Hennessi is a spelling variation of Hennessy, from an Irish surname meaning descendant of Aonghus. Like many names that began as surnames, it carries ancestry in its structure even when the modern form has been softened or stylized for given-name use.
The spelling gives it a more individualized and contemporary edge while preserving the Irish family-name atmosphere. As a first name, Hennessi feels modern, melodic, and lightly ornamental. It has the kind of flowing ending that makes surname-derived names feel more feminine or expressive in contemporary use.
Because the source surname is well established, the name still retains a sense of lineage even while the spelling moves it toward invention. Hennessi sounds approachable and distinctive, with a relaxed elegance that comes from being recognizable without being common.