Barbad OS - The Gaddy's take
Apparently, most PC's in that country ran a shoddy Operating System called बरबाद (barbAd) - hence the name barbAd-OS. The Gaddy didn't attach much significance to alternative theories like the Portuguese looking at the trees that resembled a bearded face and naming the place 'Barbados'. ('Barbado' is bearded man in Portuguese).
Whilst there, I didn't see many of those trees, but I didn't see that Operating System, either.