Meridyth is of Welsh origin, derived from the element "meri" meaning "sea," and "dith" which is a shortened form of Margaret, a name of Latin origin meaning "perla." Thus, Meridyth translates to "pearl of the sea." This unique and melodic name gained popularity in Wales during the medieval period but has since become less common. It is often associated with the Welsh legend of Merlin, the mythical prophet and magician, although there is no direct connection between the two names. The variant spelling Meridith is also occasionally used.
The name Meridyth had a peak in popularity during the early 2000s with seven births recorded in 2007. Over the span of four decades (1975-2009), there were a total of thirty-nine babies named Meridyth.