va

Where it comes from

Probably from the third-person singular present indicative of vrea (“to want, to wish”), used in its special conjugation as an auxiliary verb (cf. the first-person voi (“(I) will”), from Vulgar Latin voleō (“to want”)). This semantic shift is visible in most languages of the Balkan sprachbund, compare voi cânta (literally “I want to sing”) with Serbo-Croatian ću pevati < hoću pevati, Bulgarian ще пея (šte peja) < ща да пея (šta da peja), Greek θα τραγουδήσω (tha tragoudíso) < θέλω να τραγουδήσω (thélo na tragoudíso), Albanian do të këndoj < dua të këndoj: all being somewhat reduced forms of "I wish to sing".

An alternative etymology is that it began originally as the now rare word in etymology 2 below, from forms of Latin vādere (“to go”), and was confused with conjugated forms of voi / vrea in Romanian; compare voi cânta (“I will sing”) to the constructions in French je vais chanter and Spanish voy a cantar with the same meaning (literally, "I am going to sing").

Where it comes from

Inherited from Latin vādit, third person singular present active indicative of vādō. It is also rarely used as a second person singular imperative form, meaning "go", from Latin vāde (and plural form vați from vāditis). 16th century Transylvanian documents also display respective variant forms vă and vareți. Cognate with Italian, Spanish, and French va.