1. This uses the name the player goes by, as listed here: https://www.pro-football-reference.com/players/

2. This only considers players with exactly one first name and exactly one last name. If you're Bobby Joe Conrad or Kyle Van Noy, you don't get to participate.

3. No reusing names. This prevents circles, like Jordan Cameron -> Cameron Jordan -> Jordan Cameron = infinity.

4. There are other chains of equal length. For simplicity, I'm just including one. They're all extremely similar anyway.

5. It's possible that my code has a bug in it and it didn't actually find the longest possible chain. You can call this the longest known chain, if you wish.

Anyway, here's the name chain:

1. Tony Leon

2. Leon Joe

3. Joe Jacoby

4. Jacoby Glenn

5. Glenn Cameron

6. Cameron Jordan

7. Jordan Cameron

8. Cameron Lawrence

9. Lawrence Guy

10. Guy Dennis

11. Dennis Boyd

12. Boyd Morgan

13. Morgan Trent

14. Trent Cole

15. Cole Luke

16. Luke Urban

17. Urban Henry

18. Henry Anderson

19. Anderson Russell

20. Russell Copeland

21. Copeland Bryan

22. Bryan Clark

23. Clark Craig

24. Craig James

25. James Dexter

26. Dexter Lawrence

27. Lawrence Pete

28. Pete Brock

29. Brock Marion

30. Marion Shirley

31. Shirley Brick

32. Brick Travis

33. Travis Carroll

34. Carroll Dale

35. Dale Carver

36. Carver Shannon

37. Shannon Mitchell

38. Mitchell Henry

39. Henry Bradley

40. Bradley Marquez

41. Marquez Stevenson

42. Stevenson Sylvester

43. Sylvester Stanley

44. Stanley Blair

45. Blair Thomas

46. Thomas Austin

47. Austin Howard

48. Howard Glenn

49. Glenn Earl

50. Earl Cooper

51. Cooper Wallace

52. Wallace Francis

53. Francis Bernard

54. Bernard Henry

55. Henry Jordan

56. Jordan Kent

57. Kent Austin

58. Austin Mack

59. Mack Travis

60. Travis Curtis

61. Curtis Jordan

62. Jordan Lucas

63. Lucas Patrick

64. Patrick Hunter

65. Hunter Henry

66. Henry Lawrence

67. Lawrence Thomas

68. Thomas Booker

69. Booker Russell

70. Russell Gary

71. Gary Lee

72. Lee Thomas

73. Thomas Clayton

74. Clayton Heath

75. Heath Sherman

76. Sherman Lewis

77. Lewis Kelly

78. Kelly Thomas

79. Thomas Everett

80. Everett Lindsay

81. Lindsay Scott

82. Scott Curtis

83. Curtis Martin

84. Martin Chase

85. Chase Daniel

86. Daniel Ross

87. Ross Travis

88. Travis Henry

89. Henry Lewis

90. Lewis Neal

91. Neal Craig

92. Craig Keith

93. Keith Gary

94. Gary Richard

95. Richard Todd

96. Todd Spencer

97. Spencer George

98. George Harold

99. Harold Paul

100. Paul Cameron

101. Cameron Tom

102. Tom Curtis

103. Curtis Randall

104. Randall Godfrey

105. Godfrey Myles

106. Myles Jack

107. Jack Gregory

108. Gregory Clifton

109. Clifton Ryan

110. Ryan Terry

111. Terry Anthony

112. Anthony Lynn

113. Lynn James

114. James Logan

115. Logan Ryan

116. Ryan Winslow

117. Winslow Oliver

118. Oliver Fletcher

119. Fletcher Smith

120. Smith Reed

121. Reed Blankenship

Edit: Here's the code on GitHub: https://github.com/Useight/NameChain