Daimyo families in modern Japan?

Are there any members of former daimyo families still living in Japan? Are they prominent today?
Does the name Rukawa ring a bell to anyone?

Francesca05,

Are there any members of former daimyo families still living in Japan?

Of course. You didn't think they were terminated, did you?

Are they prominent today?

Not really.

Does the name Rukawa ring a bell to anyone?

It's not a common name, but there seems to be an actress by that family name.

Many daimyo families still exist.
The most famous person is Morihiro Hosokawa, 71th Prime Minister (1993). He was the head of Hosokawa clan too. Recently a figure skater Nobunari Oda is well known.

There were 286 daimyo families in 1867. But I couldn't find Rukawa family in the list.

There are several Tokugawa still alive and doing well. Yes the same family as the famous shoguns that ruled Japan for centuries.
Tokugawa Tsunenari, born in 1940, is the 18th head of the major branch of the family that goes back to Ieyasu.
He worked for many years in the USA, as the head of the shipping company Nippon Yūsen, and is now the head of the nonprofit Tokugawa Foundation that preserve the historical treasures of the Tokugawas. I read an interview he gave a few years ago about the Nikko festivals that he has attended since he was young.
There are several branches of the Tokugawa family. One of them has a museum in Nagoya.