Hi. I just have learned today that a few names in my father's history could be of Sephardic origin?
Fuentes, Torres, Paredes, Nava, Luna

My family does not appear to have very much information on anything, so I do not know how to go about researching much of anything.

Do you know where they lived? If it was England, and particularly London google Bevis Marks which is the congregation for Spanish and Portuguse Jews . They have been very helpful to me.
cheers and good luck p.s. there is a web site for Sephardic Surnames try googling that.
Allan

Why do you believe the persons with these names might have been Jewish?

NAVA, NAVAS (*) (29)
(*) Name for which a coat of arms, crest.or history has been found and will be published in SECTION V, Heraldry.

(29) "Sangre Judia" ("Jewish Blood") by Pere Bonnin. A list of 3,500 names used by Jews, or assigned to Jews by the Holy Office (la Santo Oficio) of Spain. The list is a result of a census of Jewish communities of Spain by the Catholic Church and as found in inquisition records. Los Apellidos estan sacados de las listas de penitenciados por el Santo Oficio, de los censos de las juderias y de otras fuentes que indican claramente que la persona portadora del apellido es judia o judeoconversa. Tiene Vd. sangre judia? (~)29) "Sangre Judia" ("Jewish Blood") by Pere Bonnin. A list of 3,500 names used by Jews, or assigned to Jews by the Holy Office (la Santo Oficio) of Spain. The list is a result of a census of Jewish communities of Spain by the Catholic Church and as found in inquisition records. Los Apellidos estan sacados de las listas de penitenciados por el Santo Oficio, de los censos de las juderias y de otras fuentes que indican claramente que la persona portadora del apellido es judia o judeoconversa. Tiene Vd. sangre judia? (~)
(30) "Raizes Judaicas No Brasil" by Flavio Mendes Carvalho. This book contains names of Sephardim involved in the inquisition in Brazil. Many times date of birth, occupation, name of parents, age, and location of domicile are also included. Included in this list are the names of the relatives of the victims. Many of the victims were tortured to death or exiled so their lines might end right there