Meaning

Can anyone tell me the meaning of ‹MŒöŽq?
In chinese, it means a rich man's son but is the meaning same in Japanese?

Yes, it means a young nobleman.

Additionally, it is often used as part of adjective to describe a noble/handsome-looking young male (not necessarily a real aristocrat), as in "‹MŒöŽq‘R"

So it can be used to describe a good looking guy who's not rich?

Gina,

As suggested, it can be used to describe a good looking guy who's not rich AS LONG AS HE'S GOT CLASS. For example, in the modern world, a lot of aristocrats have lost their fortune and I believe that both in China and Japan, many are either poor or average as far as financial means are concerned. But as long as he is a gentleman that comes from a good background, he can be called a kikoushi. On the other hand, a guy who is a rich man's son but doesn't have class is not a kikoushi. He's just a "rich spoiled kid" in which we call in Japan "bon-bon."

Generally speaking, the word "kikoushi" gives you the same impression as "prince charming." Try an image search of ‹MŒöŽq on a search engine to get some ideas. An on-line dictionary even tells us that the Japanese word "kikoushi" means "Yon-sama" Bae Yong Joon the Korean actor :)