querist
A person who queries or asks questions; an interrogator, a questioner.
But the Queriſt, and all others of his Opinion, may be aſſured, That there is no Man in England vvho underſtands the Conſtitution of his Country, that is at all concerned vvho vvere the Parents of the Child he talks of: […] [T]hat this Queriſt thinks himſelf at preſent very ſeaſonable in the Queſtions he propoſes in his Favour, is a matter vvorthy [of] Conſideration.
Where it comes from
From quaere (“(archaic) query, question”, noun) or query (“enquiry, question”, noun) + -ist (suffix denoting one who engages in a particular type of activity). Quaere and query are both derived from Latin quaerō (“to ask, question; to look for, seek; etc.”); for further etymology, see that entry.
Adapted from the Wiktionary entry querist (CC BY-SA 4.0).