The term 'Late-Night TV Host' refers to a person who hosts a television show that airs late at night. Two of the most well-known late-night TV hosts are LENO and JayLeno. LENO is a four-letter word and JayLeno is a seven-letter word. LENO is the stage name of American comedian, television host, writer, producer, and actor, James Douglas Muir LENO. JayLeno is the stage name of American comedian, television host, writer, actor, and producer, James Douglas Muir LENO, Jr. Both LENO and JayLeno have hosted popular late-night talk shows for many years.