"Blend of Maria and Lena"
The name Marialena is commonly a female name from the "Italian" origin.
Marialena is a compound given name built from Maria followed by Lena, both long-established names in European usage. The related spelling Marilena is also in use, and in that form the two elements are contracted by dropping the final a of Maria.
The pronunciation of Marialena is muh-ree-uh-LEE-nuh.