Yes it is. It is both Sephardic and Ashkenazic in origin. Originally a derivative of Shlomi, Shlomo, etc.; During the "Inquisition" in both Spain and Portugal Sloans went both east and west. Those who escaped east ended up mainly in Poland. Those moving to the west came to Portugal (from there to the New World) mainly in Brazil and worked their way North into America very early in that country's history. Some went into England (Sloane), Ireland and Scotland (Slone) and either stayed or went on to the America from there.
