Actually, Jevo comes from the English "heavy" a literal translation of the Dominican slang "Pesao" meaning slick or cool.
Or literally "Jevita" is a cool little girl.
I have discussed many slang terms with Dominicans such as
"Pariguayo" which comes, once again from the English
"party watcher" when the Americans occupied the DR in the 60's
people were assigned to oversee festivities and were not allowed to participate. Standing there watching every one else dancing,
they looked kind of stupid. Hence, " No seas pariguayo, sacala
a bailar."
Another good one is "Guachiman"- security guard or "Watchman"
I love this kind of stuff