Leonardus is a Latinized version of the Germanic masculine name Leonard. Leonardus has been a relatively common birth name in the Netherlands, though most people use(d) a short form in daily life, like Leen, Leendert, Lennaert, Lennard, Lennart, Lennert, Lennie, Leo, Leon, Leonard and Lon.
Latinized name Sanctus Leonardus (died 559 AD), Frankish noble, abbot and Christian saint Leonardus Achates (Leonhard Agtstein; f.1472–1491), Swiss printer in Italy Leonardus Bruni Aretinus (Leonardi Bruni; c.1370–1444), Italian humanist, historian and statesman Leonardus Lessius (Lenaert Leijs; 1554–1623), Flemish Jesuit theologian Leonardus Roselli (died 1606), Italian bishop Leonardus Vincius (1452–1519), Leonardo da Vinci
Birth name Leonardus Petrus "Leo" Beukeboom (1943–2017), Dutch sign painter and lettering artist Leonardus L.J. "Leo" de Bever (1930–2015), Dutch architect Leonardus Bramer (1596–1674), Dutch painter (1942–2008), Dutch bishop in Ethiopia Leonardus "Léon" Dolmans (born 1945), Belgian footballer Petrus Leonardus "Leo" Ehlen (1953–2016), Dutch footballer Leonardus J.P.M. "Léon" Frissen (born 1950), Dutch Queen's Commissioner of Limburg Leonardus Eustachius "Leen" Jansen (1930–2014), Dutch boxer Leonardus F.E. "Leon" Kantelberg (born 1978), Dutch footballer Leonardus Gerardus Kortenhorst (1886–1963), Dutch President of the House of Representatives Leonardus van der Laan (1864–1942), Dutch architect Leonardus Antonius Lightenvelt (1795–1873), Dutch Minister of Justice and Foreign Affairs Jan Leonardus "Lennie" Louw (born 1959), South African-born Namibian cricketer Leonardus Benjamin Moerdani (1932–2004), Indonesian general and Minister of Defense Leonardus Nardus (1868–1955), Dutch fencer (1699–1779), German-born Dutch librarian and university president Leonardus J.H. “Leo” Passage (1936–2011), Dutch-born American hairstylist, educator, innovator and philanthropist Leonardus P.P. "Lon" Pennock (1945–2020), Dutch sculptor, monumental artist and photographer Leonardus Syttin (1892–?), Lithuanian sport shooter Leonardus Cornelius van der Valck (1769–1845), Dutch diplomat and mysterious count in Germany Leonardus Q.M. "Leo" van Vliet (born 1955), Dutch road racing cyclist (1762–1809), Dutch politician of the Batavian Republic
See also Leonardus, fossil mammalian genus Leonardo (given name)