Betti is a diminutive of Elizabeth, a name of German origin that means "my God is my oath." It was particularly popular during the Middle Ages and Renaissance periods, often used as a name for queens and noblewomen. The name Betti reached its peak of popularity in the United States around the 1920s, but it has since declined in usage. Today, it is considered somewhat old-fashioned and is rarely heard among newborn girls. However, it remains a classic choice for those seeking a unique yet timeless name for their daughter.
The name Betti was quite popular between the early 1930s and late 1940s, with the highest number of births recorded in 1946 (37 births). However, its popularity significantly declined from the mid-1950s onwards, with fewer than 20 births per year after 1956. By the late 1970s and early 1980s, the name became quite rare, with only a few births recorded each year. Overall, there were a total of 849 babies named Betti between 1916 and 1995.