Quinn is one of the most popular Irish unisex surnames out there, a strong and attractive choice on the rise for girls but still popular for boys. A recent year saw it used for nearly 2690 girls along with 615 boys in the US, meaning its split 80:20 across the sexes.

An ancient tree that figures in literature from Shakespeare to Harry Potter and is believed to possess magical powers, Willow is a lovely name, as graceful as its inspiration.

Everest has an attractive enough sound and lofty enough meaning to come into style, à la Sierra. George Lucas bestowed this aspirational name on his baby daughter in 2013 and it has been climbing up the charts ever since. Currently in the US Top 1000 for boys, it was also given to around 100 girls in a recent year.

Dillen is an uncommon feminine name that appears to be a variant spelling of Dylan or Dillon. Traditionally masculine, Dylan comes from Welsh mythology and means "son of the sea" or "tide." This spelling variation with an 'e' instead of 'o' or 'a' gives it a slightly softer quality that may be why it's occasionally used for girls despite its masculine origins. The name has a contemporary feel and brings to mind associations with nature through its connection to water. As a feminine name, Dillen is very rare, appealing to parents looking for a gender-neutral option with Celtic roots and a modern, streamlined sound.