Fabian is the ancient name of a saint and pope that also has Shakespearean cred as Olivia's servant in Twelfth Night and more recently made an appearance in Harry Potter. In the US Fabian became best known via the 1960s teen idol/singer who went solely by his first name.
The name was brought to England by the French around the sixteenth century. Except for a few scattered earlier appearances, Fabian has been solidly on the US pop list since, 1959, now ranking at Number 312, particularly popular in the Latino community. It's even more well used in several other countries: Fabio is Number 17 in Austria, 39 in Chile and 44 in Poland. Fabiano is an attractive Italian version.