Baal Shem Tov
A Baal Shem Tov
translates as "Master of a Good Name"
, meaning someone who due to his ability to perform super- and supra-good deeds that benefit others, is "given" the title by those who recognize or have benefited from his powers. He is essentially a miracle worker, who supposedly has great spiritual powers.
It's a name that was given in the Middle Ages to a Jewish rabbi miracle worker who could bring about cures and healing, as well having mystical powers to foresee or interpret events and personalities. They were considered to have a "direct line" to Heaven evoking God's mercies and compassion on suffering human beings.
Not many people with this title have been recorded, and none have it today.
The most famous one was the founder of Hasidism, Rabbi Israel ben Eliezer, who is known as "THE" Baal Shem Tov. Few people are aware that there were some other rabbis who bore this appellation.