Oliver has barreled up the U.S. charts in recent years, going from #173 in 2006 to #12 in 2016. The name is #1 in Canada, England and Wales, New Zealand, and Australia. It’s also very popular in Denmark (#4), Finland (#5), Norway (#2), Sweden (#7), Scotland (#3), Iceland (#6), Northern Ireland (#6), Hungary (#21), Ireland (#31), Galicia (#40), and the Czech Republic (#33).
The alternate form Olivér is Hungarian, and Ólíver, or Óliver, is Icelandic.
Olivia has likewise barreled up the U.S. charts, going from #248 in 1985 to a so far three-year reign as #2 from 2014–16. Olive, not too long ago largely written off as a musty old lady name, may be poised to become a replacement for Olivia, the way Jessica supplanted Jennifer and Amelia supplanted Emma supplanted Emily. It fell off the U.S. charts in 1951, and re-entered at #989 in 2007. In 2016, it was #272, while in Australia, it was #90, and in New Zealand, it was #43. In England and Wales, it was #176.
The alternate form Olívia is Hungarian, Slovak, and Portuguese. Ólivía is Icelandic.
There are several possible etymologies for Olivia, among them the possible connection to the Latin word oliva (olive). And though Oliver comes from either an Old Germanic name like Alfher (elf army, elf warrior) or an Old Norse name like Áleifr (ancestor’s descendant; the original form of Olaf), the spelling came to be changed by association with the Latin word oliva.
If the trendiness and popularity of those names puts you off, there are plenty of other forms of these names.
Oilibhéar is Irish.
Oliber is Gascon. This spelling is considered archaic today.
Ólivar is Faroese.
Oliverio is Latin American–Spanish.
Olivers is Latvian.
Olivey is modern Gascon.
Olivier is French and Dutch.
Oliviero is Italian.
Olivur is Faroese.
Oliwer is Polish.
Oliwier is an alternate Polish form.
Oliwjer is also Polish.
Ölu is Swiss–German.
Moria was the word for a sacred olive tree in Ancient Greek.
Oliivia is Estonian.
Oliva is Latin.
Olivera is Serbian, Macedonian, and Croatian.
Olivette is French, from the title character of Edmond Audran’s 1879 opera Les Noces d’Olivette.
Oliviana is English, Spanish, and Italian.
Olivie is French and Czech. In Czech, the last two letters are pronounced separately instead of as one.
Olivienne is English.
Oliviera is Italian.
Oliviette is English.
Olivija is Macedonian, Lithuanian, and Croatian. The alternate form Olīvija is Latvian.
Olivina is Faroese.
Oliviya is Bulgarian.
Oliwia is Polish.
Ouliva is Asturian, a language spoken in northern Spain.