The Koopalings made their debut in Super Mario Bros. 3, albeit without names in the original Japanese release.
When Nintendo of America localized the game, they named each Koopaling after various musicians and celebrities.
However, at the same time DIC was creating a cartoon series after Mario 3 and gave the Koopalings a different set of names.
For a breakdown of their names, see Wikipedia’s article on the Koopalings here.
Is Bowser really their dad? If so, can we create a picture of what their mom looks like based on their genetic traits?
Check out this video…