Vick/Vicks?
My 'understanding' is the products have always been known as 'Vicks' but the company was registered under 'Vick'. Happy to be corrected!
vicks.com/en-us/vicks-history
1890'S
VICKS® CROUP AND PNEUMONIA SALVE
Lunsford Richardson, a pharmacist in Greensboro, North Carolina, creates and sells 21 home remedies under the “Vicks” name in the 1890s. Of the 21 home remedies, the best-selling version by far is the Vicks Croup and Pneumonia Salve.
The salve’s ingredients include menthol, a new and little-known Japanese ingredient. When the ointment is rubbed onto a person’s chest, body heat vaporizes the menthol, releasing soothing, medicated vapors for hours."
The company was called 'The Vick Chemical Co.' 'Vick Family Remedies Company'.
Maybe that is why some people refer to it differently ?