Wicca was popularised in the earlier part of the 20th century by Gerald Gardner and others, although its practitioners regard it as the continuation of an ancient religion. Gardner wrote that the Wiccan gods were the gods worshipped in ancient Britain, which suggests pagan origin. However, Wiccans primarily refer to a God and a Goddess and I have not read anything about Wicca embracing typical pagan gods such as a specialised god of war, etc.. Perhaps a Wiccan could tell us whether they regard their religion as a form of paganism.
There are, or were, pagan religions with no obvious or conscious connection to Wicca, e.g. the gods of the Scandinavians, Greeks and Romans. The Greeks and Romans seemed to regard all pagan religions as essentially the same. They took it for granted, e.g. that the gods worshipped by the British Celts were their own gods using different names. They even created legends to expain why the Greco-Roman gods were depicted with animal heads in Egypt. I personally have no doubt that the Greek and Roman pagan religions evolved independently and that when Greeks and Romans made contact, they just presumed, e.g. that Zeus and Jupiter were the same god.
I would say that Hinduism, being polytheistic, is another pagan religion (I am happy to be corrected if anyone disagrees) with no connection to Wicca.
