AMD has etched/printed their arrowhead logo on practically every product they've produced since the the AMD2901, but the brand logo for Ryzen is the enso.
Intel did market some products as the "i386" and "i486" but consumer-facing identification was typically "Intel 80x86". The lowercase-i IC marking practically disappeared from intel CPUs starting with the Pentium.
The "i" logo appears on early P5 models (like the P166 from 1996 I keep on my desk), and then disappears, relegated to the bottom of the CPU.
Here's some P5 shots: https://en.wikipedia.org/wiki/Pentium_(original)#Models_and_...
Pentium Pros, PIIs, PIIIs, P4s, and Core2 products are all practically devoid of the marking.
I would argue that the resurrection of the "i" branding in 2008 with the i7-920 was eased along by iProducts, especially since it practically disappeared from consumer/retail branding for over 15 years.
For these people, the tech world has existed only since the launch of the iPhone. Nothing that came before or after it matters, and Apple is the sun around which all tech revolves around.
Plenty of other companies had 'i' prefix in front of product names, even cars or dish washers.
I didn't. I said "appearance of copying" and I was very careful to choose those words.