When I got my initial 4 I went with naming them after the herbs in Scarborough fair (Parsley, Sage, Rosemary and Thyme) because I figured birds are musical creatures. Current birds are named after medicinal herbs (Juniper, Ginkgo, Vanilla, Ginger, Lavender, Basil and Chocolate Mint). Future birds will be named according to this. Ginkgo and Juniper's names are also references to other things as Juniper is also the name of a character from ace attorney (which is a game series I love) and the brothers Grimm tale the Juniper tree (it is arguably their darkest tale so be warned if you look it up) and Ginkgo's name is a reference to Ginko from the anime mushishi. Ginko is a really calm character and Ginkgo had an expression that just looked very calm and serene as a chick and that turned out to not just be for show, she is my boldest and friendliest hen and is usually the first to greet me