So Finra says the exchange they are listed on handles name/symbol, and otcm says contact Finra to change name/symbol…
This is on otcmarkets website:
How do companies change their trading symbol or name? To request a symbol change, a company must contact FINRA Operations at +1 866.776.0800. OTC Markets Group must receive notification of symbol or company name change from FINRA before any change will be made on the OTC Link® ATS or on OTC Markets The company should contact FINRA's Operations Department at +1 866.776.0800 in order to change its trading symbol or name. Any security that does not already have a symbol will be assigned one when FINRA clears the Form 211.