It includes ones who are leaving office soon, but still. Most of the ones leaving office are among the least popular. Since it's a slideshow here's the list:
50. Mary Fallin (Oklahoma)
49. Dan Malloy (Connecticut)
48. Bruce Rauner (Illinois)
47. Bill Walker (Alaska)
46. Matt Bevin (Kentucky)
45. Rick Snyder (Michigan)
44. Susana Martinez (New Mexico)
43. Kate Brown (Oregon)
42. Paul LePage (Maine)
41. Jeff Colyer (Kansas)
40. Scott Walker (Wisconsin)
39. Jim Justice (West Virginia)
38. Kim Reynolds (Iowa)
37. Mike Parson (Missouri)
36. Gina Raimondo (Rhode Island)
35. Jerry Brown (California)
34. Doug Ducey (Arizona)
33. Phil Murphy (New Jersey)
32. Jay Inslee (Washington)
31. John Bel Edwards (Louisiana)
30. Tom Wolf (Pennsylvania)
29. Ralph Northam (Virginia)
28. Andrew Cuomo (New York)
27. Rick Scott (Florida)
26. Mark Dayton (Minnesota)
25. John Kasich (Ohio)
24. Roy Cooper (North Carolina)
23. Henry McMaster (South Carolina)
22. Phil Scott (Vermont)
21. John Hickenlooper (Colorado)
20. Matt Mead (Wyoming)
19. Eric Holcomb (Indiana)
18. Butch Otter (Idaho)
17. Pete Ricketts (Nebraska)
16. David Ige (Hawaii)
15. John Carney (Delaware)
14. Phil Bryant (Mississippi)
13. Steve Bullock (Montana) (The most popular Democrat)
12. Doug Burgum (North Dakota)
11. Bill Haslam (Tennessee)
10. Gary Herbert (Utah)
9. Nathan Deal (Georgia)
8. Brian Sandoval (Nevada)
7. Greg Abbott (Texas)
6. Asa Hutchinson (Arkansas)
5. Dennis Daugaard (South Dakota) (Most popular outgoing governor. Term Limits.)
4. Chris Sununu (New Hampshire)
3. Kay Ivey (Alabama)
2. Larry Hogan (Maryland)
1. Charlie Baker (Massachusetts)
https://www.msn.com/en-us/news/politics/americas-most-popular-governors/ss-BBRZxbv?ocid=spartandhp#image=1