I love [name_m]Watson[/name_m]! From your list, I think [name_m]Ellis[/name_m], [name_m]Clark[/name_m], and [name_f]June[/name_f] go especially well. If your wanted to go down the same initial route I think [name_m]Wesley[/name_m] and [name_f]Winslow[/name_f] are distinct enough to still work, whereas [name_m]Waylon[/name_m] is a bit too similar in sound to [name_m]Watson[/name_m] in my opinion.
A few others that give me the same vibe:
[name_m]Sidney[/name_m], [name_m]Hugo[/name_m], [name_m]Percy[/name_m], [name_m]Franklin[/name_m], [name_m]Oscar[/name_m], [name_m]Lewis[/name_m], [name_m]Jasper[/name_m], [name_m]Lowell[/name_m], [name_m]Cyrus[/name_m], [name_m]Harvey[/name_m], [name_m]Crosby[/name_m], [name_m]Monty[/name_m]
[name_f]Mabel[/name_f], [name_f]Ada[/name_f], [name_f]Florence[/name_f], [name_f]Edith[/name_f], [name_f]Clara[/name_f], [name_f]Thea[/name_f], [name_f]Nell[/name_f], [name_f]Maeve[/name_f], [name_f]Harlow[/name_f], [name_f]Marlowe[/name_f], [name_f]Darcy[/name_f], [name_f]Beatrice[/name_f]
[name_f]Hope[/name_f] this helps!