What does the Etruscan form larthalisa mean?

In the Etruscan language, the form larthalisa is an example of the genitivus genitivi, or "genitive of the genitive," construction.

The word is built upon the proper name Larth. By adding a possessive suffix, it becomes larthal, meaning "Larth’s." The addition of a second genitive suffix results in larthalisa, which translates to "of that which is Larth’s."1