Proper Names

Q. When a proper name begins a sentence, is it always capitalized, even when it’s a name commonly seen as lowercase (e. e. cummings, for example)? I’m also unclear about names with particles. CMOS 8.7 says de (or d’) is always lowercased and is often dropped when the surname is used alone. How would I know that it’s dropped from Tocqueville but not from de Gaulle if neither of these names were in Merriam-Webster?

Q. What is the CMOS standard for alphabetizing names that are hyphenated and not hyphenated? This would apply mainly to persons who, instead of hyphenating their name upon being married, make their pre-marriage last name their middle name. For example, Pat Doe Smith and Pat Doe-Smith. Should both examples of this name be alphabetized under the Ds, the Ss, or would the first example be alphabetized under the Ss and the second example be alphabetized under the Ds?

Q. When referring to Orville and Wilbur Wright as a unit, should the word “brothers” be capitalized—Wright brothers vs. Wright Brothers?