Jailin Is A Boys Name Of American And Greek Origin. It Is Thought To Be A Modernized Version Of The Greek Name Galen, Which Means "calm." By Giving Your Little One A Name Like Jailin, You Can Inspire Them To Be Serene And Measured In Their Approach To Life. When Faced With Challenges, Baby Jailin May Draw On Their Inner Strengths To Remain Relaxed And Level-headed.