As of my last knowledge update in January 2022, visa requirements can change, and it's always best to check with the official authorities or embassy for the most current information. Generally, Namibian passport holders were required to obtain a visa to visit Portugal. However, visa policies can be updated, so I recommend verifying the latest requirements with the Portuguese embassy or consulate.
Yes
Since Ireland and Portugal are both members of the European Union, they no longer require passports for travellers between those two countries. If, however, you happen to be a visitor from the US who is presently in Ireland but planning to visit Portugal, then you still need a passport, and you should not try to travel on an expired passport. Visit the American embassy and renew your passport.
Absolutely !
Yes, you will need a passport at each end of the journey.
No; just the passport will suffice.
Yes, you will need to show your passport.
Not unless you need a passport to visit Weymouth.
You need a passport to go anywhere.
No, but you will need a passport to get back into the US.
Yes, you need a valid passport to visit the Grand Cayman Islands.
No you need a passport.
No they just need a passport.:)