In The Shadow radio episode "Can the Dead Talk?" (originally aired March 19, 1939) we learn Lamont Cranston's valet's name is Ames.
Keep in mind that valets and butlers perform differing duties where a valet's primary concern would be with clothing and toiletries and the butler's duties would involve supervising the household staff.
I bring this up because in season 3, Lamont's butler is named Allan. If we make the distinction between valet and butler, then Ames could be performing duties as valet while Allan performed duties as butler. Or, it could mean Ames was butler and was replaced by Allan in season 3!