“The last Adam” and "the second man" (l Cor 15: 45, 47) are scriptural expressions, but “the second Adam” is not, though it often occurs in J.N.Darby’s writings. As the anti type of Adam, Christ is “the last” - there is no other head to come after Him; while as Man, He is “the second” - in contrast with the first, but there are many made like Him. JND himself calls attention to this distinction; for example: ‘We ought not to confound the last Adam and last Man (l Cor 15), though, from never having got it straight in my memory, I am always doing so, the thought being vague’, Letters vol 1 p 360. See also: Letters, vol 3, p 350; and Collected Writings, vol 29 p205. (page 51)