cym
The name is in the Welsh language.
eng
The name is in the English language.
gla
The name is in the Scottish Gaelic language.
NULL
The language type is not set if there is only one name. This appears as
<gn:language nilReason="inapplicable" xsi:nil="true"/> (that is, the concept of language is not applicable to ‘Accepted’ names).
NULL is also used if there are two names, and the language of one or both of the names is not recorded as English, Welsh or Gaelic. This appears as
<gn:sourceOfName nilReason=”unknown” xsi:nil=”true”/>.