Marielys is of Spanish origin, derived from the combination of 'María' and 'Elisabeth'. It means 'God is my oath', reflecting its religious roots. This name gained popularity in Spain during the mid-20th century and has since spread to other Spanish-speaking countries.
The name Marielys experienced significant popularity from the late 1990s to the mid-2000s with consistent high numbers of births each year during this period. However, since around 2007, the frequency of the name Marielys has decreased considerably, suggesting a decline in its popularity.