One important thing to note: Intel has split up CPUs, microarchitetures and process nodes in 2019.
The original Skylake was the code name for processors (consumer and also later Skylake SP), it was synonym for the microarchiteture and bound to a specific process, here 14nm (established in 2014).
Again in 2017, Coffee Lake is the CPU and microarchiteture (a minor advancement over Skylake) and bound to the 14nm++ process.
With the new roadmap (2Q19), Intel broke up the static structure, now there are CPU designs like Ice Lake Y/U, Tiger Lake U, Ice Lake SP, there are microarchitectures like Skylake-based architetures as Coffee Lake Refresh and Comet Lake and new ones like Sunny Cove, Willow Cove, Golden Cove and there are different manufacturing nodes in use like 14nm, 10nm, and 7nm is in development an will be used as of 2HY21.
Intel now provides CPU generations with a mixture of different ingredients:
Some examples:
10th Gen Core CPUs:
Comet Lake U , Comet Lake (Skylake-based) , 14nm+++ (Gen9.5 iGPU; same for Comet Lake S)
Ice Lake U , Sunny Cove , 10nm+ (Gen11 iGPU)
11th Gen Core CPUs:
Tiger Lake U , Willow Cove , 10nm++ (Gen12 iGPU, Xe)
Future CPUs:
Lakefield , Sunny Cove & Tremont , 10nm+(+?)
Ice Lake SP , Sunny Cove , 10nm++ (Xeon, 4Q20)
Rocket Lake S , prob. Willow Cove , 14nm+++(+?),
Sapphire Rapids SP , min. Willow Cove, 10nm+++ (Xeon, PCIe5, DDR5, 2021)
And possibly something like:
Alder Lake S , Golden Cove & Gracemont , 10nm+++ (8 + 8 cores)