The [[ https://www.wikidata.org/wiki/Q3239456 | Min Nan Wikipedia ]] (`zh_min_nanwiki`) has the URL https://zh-min-nan.wikipedia.org/ and the aliases https://nan.wikipedia.org/, https://zh-cfr.wikipedia.org/ and https://minnan.wikipedia.org/.
`nan` is the standard conform language code for //Min Nan Chinese//. `zh-min-nan` is the grandfathered alias. (https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry)
The language codes `zh-cfr` and `minnan` are only used in MediaWiki. `zh-cfr` was added in rSVN3742. `minnan` was added in rSVN4395. Both were removed in rSVN28546.
The redirects https://zh-cfr.wikipedia.org/ and https://minnan.wikipedia.org/ are not needed anymore.
The interwiki prefixes `zh-cfr` and `minnan` are not needed anymore.