Guiomar was the muse of Spanish poet Antonio Machado in later life.
-- Anonymous User 11/4/2007
Guiomar has always seemed like a surname more than a given name to me. If I were to use this name it would only be as a second middle name just because it seems very "proper Spanish" to me. Or in other words, stuck up. I still like Guiomar though.
It looks more likely this name became from Breton Gwionwarc'h (Wiomarc'h), beared by a IX century king of Brittany. In modern Portuguese it's only a feminine name.