The name Ninja is not an actual given name, but rather a term used to describe a type of covert agent or mercenary in feudal Japan. The word "ninja" comes from the Japanese characters "nin" meaning "perseverance" and "ja" meaning "person." Together, it refers to someone who endures or perseveres in challenging circumstances.

The origins of the ninja can be traced back to the 15th century in Japan, during the Sengoku period of civil wars and political turmoil. Ninja were skilled in various forms of combat, espionage, and sabotage, and were often employed by feudal lords or samurai clans for covert operations.

While ninja are often depicted in popular culture as stealthy assassins in black outfits, their historical role was more complex. They served as scouts, spies, and messengers, and were experts in disguise, infiltration, and the use of unconventional weapons and tactics.

Some notable historical figures associated with the ninja tradition include Hattori Hanzo, a famous 16th-century ninja who served under Tokugawa Ieyasu, and Fujibayashi Nagato, a ninja who played a crucial role in the Battle of Okehazama in 1560.

Other famous ninja throughout history include Yamamoto Kansuke, a 16th-century ninja who was known for his skill in disguise and infiltration, and Ishikawa Goemon, a legendary outlaw and ninja who lived in the 16th century and was known for his daring exploits.

Although the heyday of the ninja ended with the rise of the Tokugawa Shogunate in the 17th century, the legacy of the ninja has endured in popular culture and folklore. The image of the stealthy, skilled warrior has captured the imagination of people around the world, and has been the subject of countless books, movies, and video games.