The name Delpha experienced varied popularity over the years, with its peak during World War I. From 1882 to 1924, there were consistent fluctuations, but a notable increase occurred from 1914 onwards, reaching as high as 74 births in 1921. However, post-1924, the popularity declined significantly and steadily, dropping to single digits by the late 1950s. After 1961, there were fewer than five births per year, suggesting that Delpha was no longer a popular choice for parents during this period. Overall, there were a total of 2025 births named Delpha between 1882 and 1979.