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Such a person is a porter.
The flagbearer.
Surrogate.
A knight
The person is called a Porter.
A medical term based on the name of a person is an eponym.
tax attorney
That person is the 'barbecuer'.
It get its name from its father who created it or some fantasy tht person carries within him
Food vendor
Urethra, or if you mean something that aids in getting urine out of the body, it would be a catheter.
Dermatologist.