Trivial, but important. Popolo-spec for array of alternate names for persons and orgs. Orgs, because lots of lesser known dodgy gov agencies/companies move around and rebranded with each new shuffling of ministries and ministers. https://www.popoloproject.com/schemas/other_name.json#
Also useful for matching Malaysian names. Did you know the real legal name of Malaysia's PM Muhyiddin, is Mahiaddin Bin Md Yassin as per his IC? If you only have his public name, your PEPs matching functions will always have low scores for legal documents https://www.nst.com.my/news/nation/2018/04/363919/ec-tells-muhyiddin-well-spell-your-name-correctly
A lot of name matching techniques strip out honorifics prefixes etc. but for Malaysian names, this can remove important info. eg. if a document has Datuk Najib Razak and another has Najib bin Razak. Higher chance of false positive for second one without honorifics.