Luang Pu Cheun Thìkàyano
Chana Marn translate as Defeating Maya who came to stop Lord Buddha from reaching The Perfect Enlightenment.
It was Phra Mae Thoranee that flooded away the legion of Maya (Marn).
In laymen term, Marn literally means our obstacles in life and Somdej Chana Marn is to gives devotees the will to defeat them. May it be in your mind or otherwise.
Of course, Pu Cheun amulets also gives Maha Saneh. Maybe that's what gives the edge over our problems.