There’s a lake near where I grew up. Similar deal.
In the case of Creve Coeur, Missouri, the name comes from nearby Creve Coeur Lake. Legend has it that the name comes from a Native American princess who fell in love with a French fur trapper, but the love was not returned. The princess then jumped from a ledge overlooking Creve Coeur Lake, and the lake formed itself into a broken heart. However, the truth is that the Anglo settlers in this area never learned why earlier French settlers had employed this expression.