A Visa is not required for your trip to Namibia.
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Visa Exempt:
Visa exempt for a stay of up to 90 days per calendar year.
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The traveler must:
Hold a passport valid for at least six months beyond your date of country exit and with three blank visa pages
Hold proof of onward and return flights
Hold all documents required for the next destination
Hold documents showing proof of travel purpose (e.g. business cover or support letter, conference registrations, etc.)
Hold proof of sufficient funds relative to your intended length of stay
It is recommended that you confirm with your airline that boarding will be permitted without a visa.