First Name:

Guillermo

Spanish form of William.

A Dictionary of First Names, Oxford University Press, ISBN 0192800507 

Last Name:
 
Silveira

Galician and Portuguese: habitational name from places 
called Silveira in Lugo and Pontevedra provinces or a 
topographic name from silveira ‘woodland’, a collective 
derivative of silva. 

Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4 
 
 
 
 

Gender: Masculine

Usage: English

Pronounced: WIL-ee-am, WIL-yam [key]

From the Germanic name Wilhelm, which was composed of the elements wil "will, desire" and helm "helmet, protection". The name was introduced to Britain by the Normans. It has belonged to several rulers of England, Prussia, and Germany, including William the Conqueror, the first Norman king of England. Another famous bearer was William Tell, a legendary 14th-century hero from Switzerland. In the literary world it has been borne by dramatist William Shakespeare and poet William Blake, as well as contemporary authors William Faulkner and William S. Burroughs.