* Stevin - This is a proper noun, likely referring to Simon Stevin, a Dutch mathematician, engineer, and physicist.
* Steven - This is a common male name, often spelled with a "v" instead of a "w".
* Stephen - This is another common male name, often spelled with a "ph" instead of a "v".
Please provide more context so I can help you spell it correctly. For example, are you referring to a person, a place, or something else?