"Blend of Wes and Lyn"
The name Weslyn is commonly a unisex name from the "American" origin.
Weslyn is a modern American formation built from Wes, the short form of Wesley, plus the -lyn ending that became widely productive in United States girls' names from the 1970s onward. The name first appears in United States birth records in 1986. It is a twentieth-century American construction rather than an inherited name from an older language, and no meaning is carried over from either element beyond their use as name parts.
The pronunciation of Weslyn is WES-lin.