In Thomas Hardy's The Mayor of Casterbridge (tragically I began reading this in 1992 and finished it in 2010) Elizabeth is reprimanded for her use of dialect words.
In time "she no longer spoke of 'dumbledores' but of 'humble bees' ... when she had not slept she did not quaintly tell the servants next morning that she had been 'hagrid', but that she had 'suffered from indigestion'" (Chapter XX, p. 200 in the Penguin Classics edition).
I'm not the first person to spot the names subsequently made famous by J.K. Rowling.
As an undergraduate I believed that I had some original thoughts about the Trinity only to discover that much deeper thinkers, namely Richard of St. Victor in the thirteenth century and Augustine in the fifth century, had already meditated on the same matters.
True originality is the preserve of a limited number of heretics. But upon closer examination one can usually find evidence of borrowing from philosophical sources. Most of the heresies of today are a rehash of bad old ideas that you can find in the archives of Church history.
Curiously Thomas Hardy has a line or two about open theism in his poem "God's education" (published in 1909). God is the speaker in the final stanza:
He mused. "The thought is new to me.
Forsooth, though I men's master be,
Theirs is the teaching mind."