Since the tragedy, Vichai has been widely talked about and I've seen many remarks about his surname (some quite disrespectful), so I thought it might be useful to write his name phonetically to make it a little easier for English speakers.
Srivaddhanaprabha = See-wat-ta-na-pra-pa
As you can see, there are no hard sounds at all, just a little long.
I don't think anyone finds his first name hard to say, but the more accurate way to say it would be Wi-shai as there are no V and CH sounds in Thai.
Ironically, the harder name for English speakers to say correctly is Top. The T sound in Top is not a normal T sound, but the one in words like stop or stiff, with no air coming out.
I should add that most Thai people don't expect you to get them right. If you didn't no one would take offence. This is just for those who's curious. Before we won the league, I'm sure most Thais couldn't pronounce Leicester either.
edit: just realised I posted in the wrong forum Can mod please move this?