Hi,
This dropdown use the type "categorysub" which list the categories using the "category_ordering" sort.
To use a "category_name" sortering, it should use the type "manufacturer" but it will require at this moment some modification to be compatible with what the product page expects (this type is used as a dropdown for filters, so it does not display the same kind of content).
Hope it answer to your question.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.