where did the name Mr M and Mr L come from?

Mario & Luigi's names are Italian. The designer, Shigeru Miyamoto has given them those names. Although the games and the console were created in Japan. This first Mario game was out in 1985. vv

they came from the real mario and luigi which are the fathers of Nintendo.
yes,there are people named mario and luigi in japan.That was till the real mario died and luigi took over nintendo

^ ^ Both of those answers are wrong.