[Facts] Re: About Yalissa
Where have you come into contact with this name?
I can't find any reliable indication that Yalissa means "a beautiful flower" in modern Hebrew. It is possible it is related to a word for a particular species of flowering plant, but we'd have to have someone who is an expert on modern Hebrew answer that.
To me this just looks like a Hispanic-American respelling of Jalisa, which is itself an African-American creation popularized by the television program A Different World.