The possessive form of the proper noun Eugenia is Eugenia's.example: I met Eugenia's brother at the party.
Eugenia Tuttle's birth name is Eugenia Ash.
Eugenia Paul's birth name is Eugenia Popoffon.
Eugenia Zukerman's birth name is Eugenia Rich.
Eugenia Cauduro's birth name is Eugenia Cauduro Rodrguez.
Eugenia Tobal's birth name is Mara Eugenia Tobal.
Eugenia Wright's birth name is Eugenia J. Wright.
Eugenia Gorkusha's birth name is Eugenia Aleksandrovna Garkusha.
Eugenia Buerklin's birth name is Eugenia Elizabeth Kaufmann.
Eugenia Yuan's birth name is Eugenia Yuen Lai-Kei.
Eugenia Guerty's birth name is Mara Eugenia Geraghty Zabalza.
Eugenia Roulet's birth name is Mara Eugenia Gonzlez Roulet.