The use of capitals in surnames consisting of two or more parts is helpfully explained in the Stellenbosch University’s US English Style Guide (2024:30), in particular paragraphs 5.2.3 and 5.2.4. You can find the full document here: https://languagecentre.sun.ac.za/wp-content/uploads/2021/01/Style-Guide-2014_Language-Centre.pdf

Rules for capitalising surnames with parts

This useful information comes from a PEGforum thread, Mr Le Roux or Mr le Roux, that started on Mon, 1 Apr 2024 at 15:56

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