Perfect Duluth Day

Mesaba, Missabe or Mesabi? What’s correct?

This is a perfect question for all you PDDers. Is Mesaba spelled Mesaba, Missabe or Mesabi? Was the street named after the area of Northern Minnesota? The two are spelled different. What was the building named after? It has a third spelling. I’ve lived here 25 years and am still trying to figure this out. Help!