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Dictionary of Medieval Names
from European Sources

Aldo m. Old High German alt, Old Saxon, Old Frisian ald 'old', or a pet form of any of various names beginning with this element.

Italy
Latin
1527 Aldelli (gen) Rome1527 p. 90
Cite as: S.L. Uckelman. "Aldo". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Aldo.