*Walhaz is a reconstructed Proto-Germanic word meaning 'foreigner',^[1][2] or more specifically 'Roman', 'Romance-speaker' or '(romanized) Celt', and survives in the English words of 'Wales/Welsh'^[1][3] and 'Cornwall.'^[4] The term was used by the ancient Germanic peoples to describe inhabitants of the former Roman Empire, who were largely romanised and spoke Latin languages (cf. Valland in Old Norse).^[1][3] The adjectival form is attested in Old Norse valskr, meaning 'French'; Old High German walhisc, meaning 'Romance'; New High German welsch, used in Switzerland and South Tyrol for Romance speakers; Dutch Waals 'Walloon'; Old English welisċ, wælisċ, wilisċ, meaning 'Brythonic'. The forms of these words imply that they are descended from a Proto-Germanic form *walhiska-.^[3]

*Walhaz is a loanword derived from the name of the Celtic tribe which was known to the Romans as Volcae (in the writings of Julius Caesar) and to the Greeks as Οὐόλκαι Ouólkai (Strabo and Ptolemy).^[2][5] The Volcae tribe occupied territory neighbouring that of the Germanic people and seem to have been referred to by the proto-Germanic name *Walhaz (plural *Walhōz, adjectival form *walhiska-). It is assumed that this term specifically referred to the Volcae, because application of Grimm's law to that word produces the form *Walh-. Subsequently, this term *Walhōz was applied rather indiscriminately to the southern neighbours of the Germanic people, as evidenced in geographic names such as Walchgau and Walchensee in Bavaria^[3] or Walensee in Switzerland. Place names containing the element *walhaz denote communities or enclaves in the Germanic-speaking world where Romance was spoken.^[1]

In Old English, *:walhaz developed into wealh, retaining the inherited meaning ‘a foreigner, more particularly a pre-Anglo-Saxon inhabitant of Britain who spoke Celtic or Latin or both’. It also came to imply the 'social position of the British natives that in the West Saxon dialect of Old English' came to mean ‘(British) slave’. The old feminine derivative of *walhaz, Old English wiln < *wielen < * wealh-in-, even exclusively means ‘a female slave’ and is likewise concentrated in the Saxon south of England.^[1]

From the Germanic and Slavic peoples the term passed to other groups, such as the Hungarians (oláh, referring to Vlachs, generally used for Romanians; olasz, referring to Italians), Turks (Ulahlar) and Byzantines (Βλάχοι Vláhi) and was used for all Latin people of the Balkans.^[6]

• Vlachs, also known as Wallachs
• Theodiscus
• Names of the Celts
• History of the term Wallon