Flonnie is an uncommon given name of unknown origin, possibly of American origin, as it was once recorded among African American families during the mid-20th century. It is conjectured that Flonnie may have been derived from Florrie, a diminutive form of Florence, which means 'flourishing' or 'prosperous'. However, this connection is not definitive and its exact etymology remains uncertain. The name Flonnie has never gained widespread usage or popularity, remaining quite rare even in contemporary times.
The name Flonnie appears to have been moderately popular during the late 19th and early-to-mid 20th centuries, with peak years being 1914 (40 births) and 1924 (35 births). However, it is clear that its popularity waned significantly after the 1930s. By the 1960s, it had become quite uncommon, with only five births recorded in 1961. Overall, there were a total of 1065 babies named Flonnie between 1889 and 1961.