Generally speaking, do not translate the names of public figures. For example, royalty should be referred to in the original language.
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King Philip VI |
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King Felipe VI |
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However, there are some exceptions. Popes should be referred to by the English equivalent of their papal names. Likewise, transliteration of names in non-Latin scripts can cause problems (a notable example being
Gaddafi).
Well-known Catalan figures are often referred to in English-language media by the Spanish version of their first name. Use the Catalan version, unless there is a clear and well-founded tradition otherwise. Thus,
Pau Casals, but
José Carreras.