Dallin is not "newly made up". It is a surname transfer name. It is now quite common in Utah because it is the name of Dallin Oaks, a former President of
Brigham Young University who is now on the Council of Twelve of the Church of
Jesus Christ of Latter-day Saints (Mormons). Dallin Oaks's mother named him after
Cyrus Dallin, a famous sculptor. As a surname Dallin is English and means one's ancestors came from the town of Dalling in Norfolk, England. Dalling meang "settlement of the followers of a man named Dalla" in Old English.
Links to
Cyrus Dallin:
http://www.dallin.org/
and Dallin H. Oaks:
http://www.lds.org/newsroom/biography/0,15609,3959-1----44,00.html