Pen-names
It was customary for well-known authors of medieval times to be known by the titles of their works rather than by their own names. Thus, Jacob ben Asher is referred to as the Ṭur or the Ba'al ha-Ṭurim; Joseph Caro is known as the Bet Yosef; and Ezekiel Landau as Noda' bi-Yehudah; while even more frequently were authors known by contracted forms of their names, with the addition of some honorary prefix, as given above. Among contemporary Hebrew writers this practice is still more widely observed, though no honorary title is prefixed. A list is given by Moïse Schwab in his Repertoire. Most Yiddish writers appear to prefer to write under some pen-name or pseudonym, and their example is at times followed by modern writers of Hebrew, though these, as a rule, prefer to give a name composed of their initials. Of course, other Jewish litterateurs besides the above have adopted pen-names. I. Zangwill has written under the names "J. Freeman Bell" (in collaboration), "Countess von S.", and "Marshallik"; Mrs. Frankau is known as "Frank Danby"; and so on; but there is nothing specifically Jewish about this adoption of a pen-name.
Read more about this topic: Jewish Name