Arlo, strongly associated with shaggy singer Arlo Guthrie, has an animated and cheery feel, thanks to its upbeat o ending. Some Arlo-lovers these days might be more inspired by "Justified" 's anti-hero Arlo Givens. Arlo was chosen by Toni Collette for her son, which might give it a further bounce in popularity, while Johnny Knoxville nudged Arlo into the unisex column when he used it for his daughter.
Arlo was popular in the first half of the twentieth century--it was Number 667 in 1915, for example. However, it's been experiencing a bit of a revival and might even surpass its peak in popularity -- it was one of the fastest-rising names in 2013 and currently sits at Number 677.