litigator (n.)

1880, "one who files lawsuits;" 1882, "one who argues lawsuits," agent noun from Latin litigare "to dispute, quarrel; go to court, litigate" (see litigation). Latin litigator meant "a party to a lawsuit; litigant;" it was translated in Old English as flitgern, flit-georn "one desirous of contention, a quarreler."