Quote:
Originally Posted by HarryT
It is a common mistake to think that his surname was "Doyle" and "Conan" was a "middle name". It wasn't!
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According to Wikipedia (yes, I know, always a doubtful source), the origin of the compound surname (or, I interpret, whether it's a compound surname at all) is not clear. At least his father's surname does not seem to have been compound.