Lazzaro Baldi (c. 1624 – 30 March 1703) was an Italian painter and engraver of the Baroque period active mainly in Rome. In 1695, he became principe of the Accademia di San Luca in Rome. One of his pupils was Giovanni Domenico Brugieri.
Lazzaro Donati (January 8, 1926 - 1977) was born in Florence and attended the Academy of Fine Arts. He began to paint in 1953, and in 1955 held his first exhibition at the Indiano Gallery in Florence. He is considered one of the foremost contemporary Italian painters and his paintings hang in museums and private collections throughout the Americas, Europe and Asia.
I'm Italian and today the word "Lazzaro" is not used as a synonym of leper, but we still call "lazzaretto" the place where plague or leper sufferers had to stay, away from the city. So this name is not directly connected with leprosy, but is still strongly connected. In my opinion the connection with Lazarus from the Bible is stronger than the connection with leper.
Unfortunately, Lazzaro is an old Italian term for a leper, taken from the name and I assume the leper named Lazarus in the Bible. Not sure if it's commonly known in that sense today, but worth considering if you have ties to Italy. [noted -ed]