Julia Felix, Felix a Roman cognomen meaning "The Fortunate One" was an epithet of the dictator L. Cornelius Sulla and his descendants in the Republican period. In the Imperial period it was a name involving luck as well as one of the most common cognomina and slave names.
Julia Felix was a Roman woman who resided in the city of Pompeii

Pompeii

The city of Pompeii is a partially buried Roman town-city near modern Naples in the Italian region of Campania, in the territory of the comune of Pompei. Along with Herculaneum, Pompeii was destroyed and completely buried during a long catastrophic eruption of the volcano Mount Vesuvius spanning...

. From her Roman cognomina it can be seen that her family were most likely freedmen.