The popularity of DNA testing has surged in the past few years, and companies such as AncestryDNA, 23andMe and Family Tree DNA are reaping the benefits. In 2017, Ancestry alone went from a database of just over 3 million testers in January to almost 7 million in its database by December, according to analyst estimates. With an aggressive marketing campaign and efforts to make their test more genealogy friendly, 23andMe comes in at a not-so-close second, with about 3 million t