The Allwinner A10 is a SoC that uses an ARM Cortex A8 as the CPU, a Mali 400 GPU, Ethernet, SATA, etc. Yes it's confusing. It's like calling a hypothetical Intel Core based SoC the Foobar Core 10.

Apple called their ARM SoC the A4 and then Allwinner probably designated their SoC the A10 to play off that marketing.