Conditionally assign unique values

I have data, for example:

John Doe    MD      1
Ben Doe     PA       
Cal Doe     MD      1
Drum Doe    PA       
Egg Doe     NP       
Fun Doe     MD      1

So everywhere there's an MD I have an IF condition assigning the number 1. But I want to isolate and pull all the names with a 1 consecutively. Example:

John Doe
Cal Doe
Fun Doe

I know I just have to have numeric values such as: john doe-1, cal doe-2, fun doe-3.

I'm having problem with the logic if someone can help I'll appreciate it.