Anything called "Spectrum OS" should have something to do with the Sinclair ZX Spectrum. For people who grew up with Sir Clive's cuddly 8-bit masterpiece, the word "Spectrum" has too much history in the context of computers to be casually reused like that.
Sorry, no. Rather, nothing should be named "Spectrum". There is a reason trademarks use unique spelling. Projects should use unique spelling. There is no shortage of spellings.
Funny choice, considering the amount of litigation over that name. Unless you were serious.
When Apple started, they were sued by Apple Records, the Beatles' label, and settled with a pledge to never have any activity involving music distribution.
Come iPod, they turned around and sued Apple Records.
It's a good example, you can have recognisable trademarks be common words. The trademark is restricted to particular contexts, of course -- you cannot trademark 'apple' in general.
