To be sure, this is an inexact process, not only because of the sheer passage of time, but also because some litigants may not have pronounced their own names in the way native speakers, or others, might deem correct. Where we have come across that information, we have followed the choice of the litigant. In some cases, pronunciations may even change during the course of litigation. Rumsfeld v. Padilla is an example. Two litigants with the same last name may also elect to pronounce it differently.Here's the website collecting the pronunciations.
How much do you care about saying proper names correctly? A separate question, which you might find more interesting, is what constitutes correctness in the pronunciation of a proper name. Some people feel that it's acceptable to say it like it's spelled, at least until you hear otherwise. Another notion is that whoever's name it is controls the pronunciation, but when I hear that, I think of this Brian Regan thing — scroll to 4:14 and play to the end — about talking to a woman named Caroline. Can you say that? Very few can. Correctly.
ADDED: As for spelling and punctuation, from the first link:
We resisted the temptation to correct the Supreme Court’s erroneous spelling of M‘Culloch v. Maryland, 17 U.S. (4 Wheat.) 316 (1819), which should be M‘Culloh, MARK R. KILLENBECK, M’CULLOCH V. MARYLAND: SECURING A NATION 90 (2006) (noting variant spellings), nor have we addressed punctuation issues such as the “turned comma” (Unicode character U+02BB, see U+02BB: Modifiers Letter Turned Comma, CHARBASE, www.char base.com/02bb-unicode-modifier-letter-turned-comma), which has been dealt with definitively in Michael G. Collins, M‘Culloch and the Turned Comma, 12 GREEN BAG 2D 265 (2009). As for the pronunciation (/məәˈkʌləә/), we are indebted to Francis P. O’Neill, Reference Librarian, and Iris Bierlein, Special Collections Curator, Maryland Historical Society.