What with the resurgence of W names like Weston and Walter, the prominence of high profile actress Emma and golfer Bubba, and even the attention paid to Watson, the IBM computer on "Jeopardy" (named for IBM's founder, Thomas Watson) this name could be in line for a revival of its own.
Watson is the 20th most common surname in Scotland, meaning the son of Wat, an early nickname for Walter. Among the earliest emigrants to the Virginia Colony from England was John Watson in 1635. Later noted bearers of the surname include Alexander Graham Bell's telephone experiment partner Thomas A. Watson ("Mr. Watson--come here!"), James Watson, co-discoverer of DNA, and actress Emily. Two well known Watsons in fiction are Sherlock Holmes's accomplice, Dr (John) Watson, and Spider-Man's love interest, Mary Jane. All in all: a name with a varied and fascinating heritage.