Variant of Henrietta, the French feminine of Henri (Henry), meaning ruler of the home.
Henrettia is a variant of Henrietta, the French feminine form of Henri, meaning "ruler of the home." That meaning has helped the Henri- family remain associated with nobility, domestic authority, and classic European style.
Henrettia feels elaborated and stately, with a more ornate look than the standard form. It sounds formal and old-fashioned in a graceful way, like a name preserved from an earlier era but still capable of modern elegance. The extra letters lend it a refined, slightly decorative character.