Feminine elaboration of Ernest, from Germanic "ernust" meaning serious or resolute.
Earnestean is a feminine elaboration of Ernest, which comes from the Germanic root ernust, meaning serious or resolute. That root gives the name a moral and character-based seriousness that has long appealed in European naming.
The elaborated ending softens Ernest into something more ornamental and feminine while preserving its old-fashioned dignity. Earnestean feels elaborate in the best historical sense, like a name shaped by a period that liked graceful extensions and virtue-laden sounds. It carries both strength and a certain decorative charm.