Image names are determined by the corresponding exchange root URL
minus the top-level domain (TLD)
.
https://www.gdax.com/
Root URL:
gdax.com
TLD:com
Image Name:gdax-square.png
https://gate.io/
Root URL:
gate.io
TLD:io
Image Name:gate-square.png
https://www.huobi.pro/
Root URL:
huobi.pro
TLD:pro
Image Name:huobi-square.png