In the Ojibwe language, the prefix "gichi-" means "great", "ziibi" means "river", and "gami" means "lake". So the Mississippi River is the "great river river", and Lake Michigan is "lake great lake".
English speakers might be most familiar with "gichigami" as used to refer to Lake Superior in The Wreck of the Edmund Fitzgerald. However, Lake Superior
in Ojibwe is "Anishinaabewi-gichigami" (Anishinaabe’s Sea), named after
the Anishinaabe people, a group of tribes of whom the Ojibwe are a member. Lake Michigan was called Ininwewi-gichigami (Illinois' Sea), named after the Illinois Confederation. The map of the great lakes in a previous link is oriented with East facing up because that is the standard orientation in Ojibwe culture.
"Zhigaag" means "skunk". "Chicago" comes from Ojibwe "Zhigaagong", meaning "On the skunk", short for "Gaa-zhigaagowanzhigokaag", "At the Place Abundant with Skunk-grass". This refers to Allium Tricoccum, also known as ramps or wild leek, a relative of the onion, and is also a deeply appropriate name for this beautiful city.
Inspired by:
https://lingthusiasm.com/post/684727483493384192/episode-68-tea-and-skyscrapers-when-words-get