This was the name of several dukes of Brittany, and Breton settlers introduced it to England after the Norman Conquest. Famous modern bearers include Alan Shepard (1923-1998), the first American in space and the fifth man to walk on the moon, and Alan Turing (1912-1954), a British mathematician and computer scientist.
This name has been common (in various spellings) throughout the Christian world, and it became very popular in the Middle Ages. Saint Andrew is regarded as the patron of Scotland, Russia, Greece and Romania. The name has been borne by three kings of Hungary, American president Andrew Jackson (1767-1845), and, more recently, English composer Andrew Lloyd Webber (1948-).
As an English name, Hannah was not regularly used until after the Protestant Reformation, unlike the vernacular forms Anne and Ann and the Latin form Anna, which were used from the late Middle Ages. In the last half of the 20th century Hannah surged in popularity and neared the top of the name rankings for both the United States and the United Kingdom.