Why is Luigi named Luigi?

Answer 1

As noted in Wikipedia, and cross referenced with arcade-musem.com, "...the name Luigi [was] inspired by a Pizza parlor near Nintendo of America's headquarters in Redmond, Washington, called "Mario & Luigi's." However, it is also commonly believed among Japanese that the name Luigi comes from the Japanese word "類似 （るいじ） (ruiji)," which means "similar" or "bearing resemblance." This may be purely coincidential, or it may have influenced Nintendo's decision.

Answer 2

Mario, invented in 1981, has been called many names. His original name was "Mr. Video", and then later he became Jumpman. At the time however, Mario was unable to jump, so the name did not fit. The most popular theory on how Mario got his name comes when creator Shigeru Miyamoto was localizing Donkey Kong for his newly targeted American audience. He was staying in an American Nintendo warehouse, when the building owner Mario Segale confronted the president of Nintendo, demanding back rent. After much arguing it was decided the men would name a video game character after the man as payment, and Mario was born.

Answer 3

because it's a Italian name and luigi is Italian.