Correct, that he wanted pre-1830.. and all that was given are pre-1830. It doesn't take a genius to do a quick google on the names and works on pre-trib views. Which apparently he did

Guess that makes him smarter than average.
Darby is said not have 'contemporaries' during his time regarding this view. However it is not hard to note in just some easy and basic googling these people held their views PRIOR to Darby making them popular, not beginning. Darby is noted to have said that this view of Pre-wrath or Pre-trib rapture was something he came to through his own personal studies, NOT hearing it from other but that it "jumped off the pages" at him (so-to-speak) as he continued to study the Word of God.
ALL views regarding the rapture make the above statement and one even Joseph Mede declared. Anyone who denies the church will be raptured (irregardless of timing) and return to a literal Kingdom of Christ is not only unorthodox in their views but have left proper hermeneutics for something less than biblical.