Dear Mr. Almaguer:
Many
Jews (the descendants of
Abraham) emigrated from their lands when the
Greeks destroyed the 2nd
Temple of
Jerusalem. There are some migrations patterns very well defined from Anatolia, to Italy, Sicily, North of Africa and certainly Spain amongst many others. They settled in almost all Iberia, with concentrated populations in
Galicia,
Toledo,
Sevilla, Cantabria, etc. By that time there were also the
Moors still dominating what we know as Spain nowadays. Political and economic circumstances obligated the
Kings of Spain to force the Jewish people to leave the country, this was by 1490, many of them emigrated to Portugal and very few to the Americas. At this point it must be said that surnames became to appear latter in Spain related to the father's first name, the site they were living, their works they performed or their physical features.
Jews officially adopted surnames just to the beginning of the 17th century, many of them were known by a
Spaniard surname and by his Jewish family name, just like Ben (son of) or Bar (daughter of) the father of the family, thus, they had names such as Luis
Lopez de
Medina (
Spanish name) but actually he was David Ben
Zacharias.
Certainly many of them conserved their
Spanish surnames and converted to Catholicism and remained as Catholics just to our days. Frequently, surnames as you mentioned in your message appear related to families that conserved their Jewishness and all their linage. Thus it's very difficult to determine with a
Spanish surname whether is Jewish or not, without trial papers, a defined lineage and practicing Judaism.
In this same thread, few months before, I cited some criteria to define a Jewish Sephardic Ancestry. But without any other evidence that only the surname, it's practically impossible to precisely determine if a person is a
Jew. Historians and Anthropologists go further when they say that being a
Jew is a religious-cultural issue more than an inherited ethnicity. Despite the Torah establish the contrary, and Genealogists try to clarify an output.
Hope this lines may clarify your doubts or answer at least partially to your questions.
Sincerely
Jesse