My family name, Estévez, comes from Galicia, to be exact from Quiroga Valley, in the province of Lugo. Now, we can found this name in another parts of Spain (Granada, for instance), and even in Argentina and another ncountries, in South America.
I couldn't find another Herminia Estevez on the Web!. There are two references there, but related to me (a book I translated from English to Spanish and a remark about a course of cooking I took part some years ago). But, apart from this, you can't find anything. I feel the only one of my sort!