From the valley; prides people
Dallin is primarily an English surname-turned-given name. It most likely derives from the Old English 'dael', meaning valley, or potentially from 'dæl-wine', meaning a proud friend or pride's people. It has seen particular popularity within the LDS community in the United States.
Less common today
Dallin isn't in the latest US Top 1000. It last peaked at #729 in 1999.
First Counselor in the First Presidency of the LDS Church and former judge
Professional rugby league footballer
Professional soccer player
US births per 5-year period, 1990βpresent (SSA data).