Dear Harry, I was speaking in a sense of genealogy too.
We CAN'T say that ALFARO has been identified as a Sephardic name for the Spanish Church. The Inquisition prosecuted false conversed jews and some of them took the christian surname ALFARO trying to seem 'old christians'.
If we want to provide real searching tools we have to say all the options:
"If your surname is ALFARO we dont know your exact origin; may be from Spain, may be christian, may be jude, may be indian... There are several families called Alfaro with differents origins"
I think that it's a reasonable way to help people tracing their family line.