Ending with mammal or Mendel

IAN

Think of a common suffix for Scottish names or a term in genetics that follows a famous scientist's first name.

This clue plays on the last part of two words: "mammal" and "Mendel." The suffix "-ian" appears at the end of both—like in "platypus" (a mammal) or "Mendelian" (relating to Gregor Mendel, the geneticist). The answer is simply that shared ending, stripped down to "IAN," which also works as a common first name. It’s a neat way to hide a name inside scientific terms.