That's not a portmanteau though is it? I thought a that was when you joined two words, eg hungry + angry = hangry. Maybe portmanteau has different variations that I'm unaware of - though I know I probably just sound like a pedant.
You're totally right, you're a pedant. JK, I was indeed confused, I don't know how to call a long chain of parallel associations like flash,fla -> flash gordon,alf -> gordon shumway -> shumway. Maybe it's a first.
It was probably a sequence of thoughts, but the flash gordon | alf relationship is parallel, they're unrelated above the convergence point that is shumway.