Over a span of nearly four decades (1881-1923), the name Flo experienced significant fluctuations in popularity, with birth counts ranging from a low of 5 to a high of 57. The peak years for the name were during World War I, particularly in 1916 and 1917, with a total of 113 births recorded in those two years alone. However, after 1923, the name's popularity began to decline sharply, with fewer than 20 births recorded annually until it reached its lowest point in 1965 with only 5 births. Overall, there were 2089 births named Flo during this period.