How can I know whether my surname is of Sephardic origins?

The best way is to consult experts or academic entities with extensive experience in the area. There are companies and researchers in different countries who are professionals in that field. Enquiries can also be addressed to Genealogy departments that may exist in universities or academic institutions, either in the country of origin or in that of residence of the person interested.

My surname is included in the list of Sephardic surnames published on the internet. Is that enough?

The lists published on the internet are not valid nor a supporting evidence.

Should you believe your surname might be of Sephardic origins, you must gather supporting documentation and address to any entity with proven competence where your claims of having a Sephardic surname are reasonably substantiated.