Logonym

Within the field of linguistics the term logonym is used to refer to the  name of a particular language, dialect, language variety. Logonyms may be either officially recognized names (e.g., via a governmental authority or the ISO 639-3 code) or less formalized or standardized names used by speakers or non-speakers to denote a particular language. The term logonym is sometimes used interchangeably with ethnonym; however, the former differs from the latter in applying specifically to the language rather than the clan or ethnic group. Thus, two different clans speaking the same language may have different ethnoyms but the same logonym.

The term logonym often appears in discussion of appropriateness or inappropriateness of particular appellations.