These plants from Holland are not named according to "the rules", but most Nepenthes crosses aren't either. The plants coming from these large TC nurseries are intended to be sold in garden centers around the world and are easy growers under a wide range of conditions. I don't know what 'Velvet' looks like, but it is probably one or the other of two choices: the N. 'Corn.bak' plant, which appears to be a cross of N. maxima x N. fusca, or @. the N. 'Miranda' plant which appears to be a Mixta hybrid, possibly maxima x mixta.
Remember, these tc Neps are produced from seed. Neps cannot be mericloned like orchids, at least not on a large scale, so they are all the result of cross pollination. The N. coccinea is probably tissue cultured from seed produced by crossing a male N. coccinea onto a female coccinea. Thousands of identical clones are produced from one seed. Usually the plants are tested before they are put out into the marketplace, and these Dutch produced hybrids are beautiful and vigorous. I find they produce more ground shoots than average, and thrive in a wide range of conditions.
Trent