The word "bok" typically refers to the sound that a goat makes. It is an onomatopoeic term used to describe the noise that goats produce. Full definition
I just cooked with baby bok choy for the first time last night! (kitchenconfidante.com)
Try adding Bok Choy or spring onion... top with fresh parsley or coriander... swap the noodles with rice, egg noodles or pasta... Lemongrass or ginger... chillies or all spice.... (greenplanet.com)
At the young ages of 3 and 4 years old, our little ones eat sauteed green beans, stir fry with bok choy, kohlrabi, and lentil soup. (thelunchtray.com)