Lavi is a rare member of the trendy leonine group of names in the US, but in Israel it's among the Top 10 boy names. It makes a good alternative to Levi.

Lucifer is the name of the archangel cast into hell and while theologians disagree on whether he and Satan are separate beings, it long been on the list of forbidden names for religious and non-religious parents alike. With connotations of hell and devilry so strongly attached to it, the name is officially banned in some places, including New Zealand.

Unisex Japanese name more often given to boys.

Along with Mika, a nickname for Mikael.

A very unusual biblical name, Rei was one of David's most loyal supporters.

A very popular unisex name in Japan, Ren is a concise and versatile choice that could work across multiple languages. A rising star in England and Wales where it ranks in the Top 1000, it is also on the rise in the US where it was give to nearly 90 girls and 200 boys in a recent year.

An appealing Finnish name, with a touch of literary magic and whimsy, Runo means "poem" in its native language. Traditionally said with a slightly rolled R and a softer 'oh' sound at the end (more like in on that in open), it comes from the Proto-Norse and Proto-Germanic, where it means "secret, literature, letter", in turn relating it to rune.

Samael is an archangel in Talmudic lore — a figure who is the accuser, seducer, and destroyer. He is often made to resemble Satan, although his jobs are not all necessarily evil (such as destroying sins).

Seren, meaning "star", is one of the top girls' names in Wales, but as a boys' name it has a different derivation. It's a rare Polish form of the Latin Serenus, mostly used to refer to the Saint and meaning "serene". It could make for a handsome and almost unknown alternative to rising star Soren.