1. helvetian - Noun
2. helvetian - Adjective
Same as Helvetic.
A Swiss; a Switzer.
Source: Webster's dictionaryThe Valais and the regions around Bellinzona and Lugano also seem to have been well-populated; however, those lay outside the Helvetian borders. Source: Internet
Their confessional documents are the following:The Heidelberg Catechism, The Second Helvetian Confession. Source: Internet