Melynn is of Welsh origin, derived from the male name Melan, which means "chief" or "prince." However, it is a unisex name, also used for females in some cases. The name Melynn gained popularity during the mid-20th century and has since maintained a steady presence in naming trends. It is often associated with Welsh culture and history, but its use extends beyond Wales to various English-speaking countries. Melynn is typically spelled with two 'l's, but variations such as Mellyn or Melyn also exist. In terms of popularity, it is not one of the most common names, which may contribute to its uniqueness and distinctiveness.
The name Melynn appears to have seen its peak popularity during the late 1950s and early 1960s with seven births each in 1959 and 1960. After a gap of several years, it saw another surge in the late 1980s to mid-1990s, with five births each in 1991, 1993, and 2000. Overall, there have been a total of 44 births recorded with the name Melynn since 1957.