First name means "Just", derived from Latin... not that the name itself doesn't give that away, what with "Just" being the first syllable.
Last name isn't listed, but I can tell you that it happens to be, as some names are, one of a family of names which, due to illiteracy, have a number of variations which sound similar because they were all originally the same. In this case, Irving is listed as coming from a Scottish place name meaning "green water" (other variations on the name are Erwin, Ervin, Irwin, Irwing... ugh).