The person who discovered the pancreas cells is Paul Langerhans,
a German biologist and pathologist. These cells called "Islets of
Langerhans" are cells in the kidney that produce insulin, the blood
suger level reducing hormone (i.e. if these don't work, you have
diabetes).
Occasionally, "Isles\Islets of Langerhans" are used as a form of
comedy or nonsense place names.