‘Natty’, which means to look smart in appearance, is a presumed derivative of ‘neat’.
Synonyms for ‘Natty’ include ‘Dapper’ and ‘Jaunty’ – both previously used in Ubuntu codenames (Ubuntu 6.06 Dapper Drake and Ubuntu 9.04 Jaunty Jackalope, respectively.)
The origin of the name ‘narwhal’ is a bit more disturbing.
Ancient sailors traversing the bitter cold seas around Greenland, near the Arctic, often came across the sole-horned creature and so likened its skin to the pallid colour of the dead that it’s name in Old Norse - narhval – literally meant ‘corpse whale’.
It’s from this macabre description that ‘Narwhal’ is derived.
Image Credit: amutalrespect.org