[Stooky Bill]

Surely Granada beats that – named after the founder’s favourite Spanish holiday destination.

That's very true, although it predated the TV station by a couple of decades

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Westward may have been so named because of this:
en.wikipedia.org 

Yes apparently named after the town of Westward Ho! as it was where Peter Cadbury's favourite golf course was. There's also a link to the novel of the same name, it being set in Elizabethian times and featuring Francis Drake, and Westward TV's logo being The Golden Hind. 

However it is of course an adjective meaning to go west so it's a relevant name in itself

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A few of the earlier ITV stations were named after their parent companies or came about as the merger of other companies.

ATV born out of Lew Grade's company after it was merged with the ITC, and Rediffusion was partly owned by a newspaper group. 

Associated Rediffusion was part owned by Associated Newspapers. When they sold up it changed its name to just Rediffusion.