Is the word 'mango' a proper noun?

The Word "mango" is a common noun, a Word for any mango.

A proper noun is the name of a person, a place, a thing or a title; for example:

• Charles W. Mango MD, Bronxville, New York
• Mango, Florida
• Blue Mango Inn, Malay, Philippines
• The House on Mango Street by Sandra Cisneros