Many a Jewish book is known colloquially by its title, like Avne Nezer and More N'vuchim. Many a one is known colloquially by its author's name, like the commentaries of R' Moshe Alshich and Malbim on Tora and N'viim (and Malbim's on K'suvim; called "Alshich" and "Malbim" even though each volume has its own title), and Bes Hab'chira (called "M'iri"). And an occasional one is known colloquially by the title of another work of the same author's, like Toras Moshe (called "Chasam Sofer al haTora").
R' Yaakov of Lissa wrote a commentary on each of the five m'gilos: Imre Yosher on Rus, Taalumos Chochma on Koheles, Tz'ror Hamor on Shir Hashirim, Palge Mayim on Echa, and M'gilas S'sarim on Ester. What are they called colloquially?
 This is also the title of the Alshich on chamisha chumshe Tora, incidentally.