patented variety - trade name
As you figured out, it is a variegated variety of dwarf Schefflera, S. arboricola 'Golden Capella'. its very popular in Florida as a landscape plant. As a house plant it needs even more light than the other forms because it doesn't have as much chlorophyll-bearing leaf area.
Its patented, so commercial propagation is by arrangement with the patent holder. This does not mean you can not make more for yourself.
I have a list of 19 patented arboricolas. Will put it up here at some point.