ZionT

Music artists often have strange stage names, and Korean hiphop artists are no exception. Recently on a post on Freestyle Town experts discussed several rappers and the meaning behind their stage names.
A translation of the article can be found below:
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Name Explanations  Let’s See How Much You Know 
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Loco (Kwon Hyuk Woo)
When he consumes a lot of alcohol, he starts barking and people call him “crazy,” or “loco.”
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Giriboy (Hong Si Young)
The phrase “see the way” can be romanized as “bo-i gil-i,” so he changed it around to Giriboy. The way in front of him appears to be quite promising these days!
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Choiza (Choi Jae Ho)
His rapper name came from his nickname “Strongest….” Uh yea…”that” part that’s specific in males..
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Beenzino (Im Sung Bin)
When he was younger, he liked a singer named Benzino. He replaed the “Ben” with the “bin” part of his name and it turned into Beenzino. 
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Black Nut (Kim Dae Woong)
His name means what you think it means…Black NUT
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Zion.T (Kim Hae Sol)
“Zion” refers to the capital of Jerusalem as designated by David, and “T” was chosen because it resembles a cross. (Zion.T is a church oppa).
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E-Sens (Kang Min Ho)
“E-Sens” is short for “essayistic sens,” referring to his writing skills. 
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Hanhae (Jung Han Hae)
It’s just his name.
Source: Freestyle Town