Saul Goodman, whose real name is James Morgan "Jimmy" McGill, is a character prominently known from the television series "Breaking Bad" and the prequel series "Better Call Saul." The reason for the use of the name "Saul Goodman" as a professional alias is explored and explained in the prequel. In "Better Call Saul," Jimmy McGill is a struggling lawyer trying to step out of the shadow of his successful older brother, Chuck McGill. Throughout the series, viewers witness Jimmy's transformation from a small-time attorney trying to do the right thing, to a more morally flexible character who adopts the persona of Saul Goodman. The name "Saul Goodman" typically sounds like "S'all good, man," which implies that everything is good or taken care of. This pseudonym was initially used by Jimmy as a persona when producing low-budget television commercials to sell pre-paid mobile phones as a side hustle. He realized that the catchy name helped attract a certain type of clientele who preferred not to use their real names or information. As Jimmy's character evolves, he adopts the Saul Goodman moniker more extensively, especially when dealing with morally gray areas and offering his services to clients on the fringes of the law. This transition signifies his increasingly crooked approach to the law and marks a clear departure from the more straight-laced Jimmy McGill. The alias "Saul Goodman" becomes a crucial aspect of Jimmy's identity as it embodies his transformation and aligns with his drive to succeed in an often unscrupulous legal system, the challenges he faces with his own conscience, and the ongoing theme of personal reinvention that is central to the series. In summary, Jimmy McGill adopts the name "Saul Goodman" as a professional alias to better align with his changing persona and clientele, signifying his transformation and acceptance of the more unethical aspects of his legal career, which become fully realized in "Breaking Bad."