Noether is the family name of several mathematicians (particularly, the Noether family), and the name given to some of their mathematical contributions:
Max Noether (1844–1921), father of Emmy and Fritz Noether, and discoverer of:
Noether inequality
Max Noether's theorem, several theorems
Emmy Noether (1882–1935), professor at the University of Göttingen and at Bryn Mawr College
Noether's theorem (or Noether's first theorem)
Noether's second theorem
Noether normalization lemma
Noetherian rings
Nöther crater, on the far side of the moon, named after Emmy Noether
Fritz Noether (1884–1941), professor at the University of Tomsk
Gottfried E. Noether (1915–1991), son of Fritz Noether, statistician at the University of Connecticut