MARK ALLEN; BLAKE ANDREWS; ALBERT AUGUSTUS, Jr.;
JACK BELMONT; ALEX BLAKE; FREDRIC BLAKE; J. D. BLAKE;
REX CHARLES; JOHN DAVIDSON; CARSON DAVIS; FRED DAVIS;
JAY DAVIS; JACK DONALDSON; CHARLES ENGLISH; FRANK EWING;
DONALD FRANKLIN; DONALD FRANKLYN; GEORGE FREDERICS;
HOWARD JACKSON; FRITZ JANTZEN;  DAVID JOHNSON;
HAL LAMBERT; FRANK MACDONALD; FRED MACDONALD;
FREDA MACDONALD; CHARLES NUETZEL; ALEC RIVERE;
STU RIVERS; JACK TURNER; JAY WEST; RITA WILDE.

There were several others I used in short fiction/articles, mostly lost in memory or in magazine files I keep locked away so that the publication monsters can't find them.