It is said that Sri Radha is herself the "Devotional energy" of Lord Shri Krishna who is the Lord of the universe. Her name always comes before the name of Lord Krishna that is why God's one name is "Radha Krishna" also. Just take out only one "R" from "Radha Krishna" & it becomes just "aadha Krishna" i.e. "half Krishna" & that is the power of the name "Radha".
"Shyama" is another name of Shri Radha.
"Meri bhav badha haro, Radha nagari soey,
Ja tan ki jhaien parat, Shyam Harit duti hoey."
Hey, Goddess Shri Radha, You take care of my life of all troubles, Who's body shadow is enough to make Lord Krishna happy.
Read more about Sri Radha Rani............here.