The noun evangelist has the regular S plural evangelists.
In Acts 21:8 and 2 Timothy 4:5. The plural form is found in Ephesians 4:11.
It would range from Zero for a Jehovah's Witnesses evangelist; to an enormously high number for a Protestant evangelist.
John Darby - evangelist - was born in 1800.
Johann Evangelist Holzer was born in 1709.
Johann Evangelist Holzer died in 1740.
John Evangelist Stadler was born in 1804.
John Evangelist Stadler died in 1868.
Michael Reid - evangelist - was born in 1944.
Paul Rader - evangelist - died in 1938.
Paul Rader - evangelist - was born in 1878.
Bob Mortimer - evangelist - was born in 1954.
Francis Murphy - evangelist - died in 1907.