Acuna's in my family are light skinned as well. But this does not mean much. Spaniards range from very light skin with dark hair and eyes or light hair and eyes with olive skin.
Was your father born in Spain? If so, look at your birth certificate from the United States.It should say what part of spain he is from. Example:Mine says that my father was born in Seville Spain.He was born in Seville but his entire family are from the region Fuente de Cantos, Badajoz, Spain.
If your dad was born in Spain and became a citizen here, you can obtain a copy of his social security application for approximately $15.00.It can be purchased on line. This will tell you the name of his parents and where they came from.
Just a little bit of info.Some have noble lineage.
Send me your e-mail address and I will send you a copy of my family tree.
Keep in touch. Maria
P.S.My last name Corrales is my adoptive grandmothers last name.Senora America Corrrales from Tenerife, Islas Canarias (Canary Islands) Spain adopted my father and his young sister when they were orphaned during the spanish civil war.