Look at the new and ominous connotations linked to the name of Mr. Hyde found in chapter two of "Dr. Jekyll and Mr. Hyde."

The name Hyde can represent how Dr. Jekyll's dark side is hidden in Mr. Hyde.  Hide means "to conceal," so Dr. Jekyll's darker, evil side is hidden in Mr. Hyde.  Now that Mr. Hyde has actually murdered someone, an even more evil side of Mr. Hyde (Dr. Jekyll) has emerged, which is disturbing for Dr. Jekyll.  Later, Dr. Jekyll finds himself unable to really control when Mr. Hyde emerges.  He no longer needs the chemicals to make Mr. Hyde come "out."  At the end, he becomes Mr. Hyde once again in order to commit suicide and to not have to go to prison.