Merlo Surname in Italy

The surname Merlo is strongly established in northern Italy, especially in Piedmont and Lombardy, and is also widespread across the rest of the North; smaller branches are found in Sicily as well. Its origin is most likely personal rather than place-based: it may come directly from the medieval Italian given name or nickname Merlo, sometimes linked to the Latin Merolus, or from the Frankish name Merle, including through diminutive or augmentative forms. A toponymic origin is possible but less convincing; places such as Castelletto Merli in the Alessandria area, Montemerlo in the Padua area, and Merlino in the Lodi area have been suggested. The surname is already documented in medieval records from the 12th century.