

Well it sounded plausible to me but it's wrong. It's one of three main theories about the origin of the name. The other two are that there were three Torii brothers (san Torii) or that founder Torii especially loved his son (son Torii). These are also wrong.
Instead, it comes from the company's first hit product, "Akadama Port Wine", which came out in 1907. The original label used an image of the sun alongside the name Torii (the bottle above dates from the 20's; the sun is still there but the company name Kotobukiya is more prominent). When their first Japanese whisky was introduced, the name Suntory was born.
As told by a guy who works on their advertising account.