Jonas has a slightly more grandfatherly image than the English version of his name, but that only adds to its retro appeal. And though it may lag behind Jonah in this country, Jonas is riding a huge wave of popularity in Europe, where it ranks highly in Germany, Switzerland, Austria and Norway.

Trevor, a British standard, took a long time to cross the Atlantic, but finally began its rise here in the 1980s. It is now a thoroughly naturalized citizen, though it still retains a touch of Anglo class.