Languages of the European Union languages, Latvian and Lithuanian; the Celtic languages, including Irish; and Greek are also Indo-European. Outside the Indo-European family, Estonian, Finnish, and Hungarian are Uralic languages while Maltese is the only Afroasiatic language with official status in the EU. The Basque language, a language isolate whose roots are unknown, is an official language in some parts of northern Spain, but not an official language of the EU. Most official EU languages are written in the Latin script. The two exceptions are Greek, which is written in the Greek script, and Bulgarian, which is written in Cyrillic script. With the accession of
Uralic languages evidence of a number of extinct languages of uncertain affiliation: Traces of Finno-Ugric substrata, especially in toponymy, in the northern part of European Russia have been proposed as evidence for even more extinct Uralic languages. All Uralic languages are thought to have descended, through independent processes of language change, from Proto-Uralic. The internal structure of the Uralic family has been debated since the family was first proposed. Doubts about the validity of most of the proposed higher-order branchings (grouping the nine undisputed families) are becoming more common. A traditional classification of the Uralic languages has existed since the late 19th