[Quoth]

Prefixes (von der, de, le etc and variable case, even M’ vs Mac), double barrelled names without a hyphen.

Sometimes I'm not sure and the paper book is my guide. Web info seems careless.

Then there are those authors that vary the prefix name or presence of an initial per genre.
M. R. Carey vs Mike Carey
J. Michael Straczynski vs J. M. Straczynski
Iain M. Banks vs Iain Banks

James Mathew Barrie is usually J. M. Barrie, but Gutenberg can be weird on names.

Edit:
I prefer the well known name from the cover and I'd put a real name in the comment. Examples Leslie Charteris, John le Carré . Of course I'd also use the house name Franklin Dixon, Carolyn Keene, Laura Lee Hope and put the real author in the comment if known, or important (Mildred Birt?). Then some have fake titles such as Captain W. E. Johns, who was never a Captain, but did serve in WWI.