Just a small correction:
日本橋室町 is Nihonbashi Muromachi
All other 日本橋××町 is Nihonbashi XXcho, but somehow 室町 is pronounced Muromachi.

http://www.iijnet.or.jp/ynp/edo/edo10_02.html
Photo of the stone to mark where the Anjin's house was.

Quote Originally Posted by Maciamo
After his death, his son, Miura Anjin, kept his title of samurai. Up to this day, the Miura Anjin Festival is held all day on August 10 in Itō, Shizuoka.
I think Muira Anjin is the Japanese name of William Adams himself.
According to Wikipedia he was married to a Japanese called お雪 and it is said he had a son (Joseph) and a daughter (Susanna).
I don't know whether Joseph also had a Japanese name (though it's very likely he had) and what was the name if he had one...

edit: I found out that his son succeeded the name 三浦按針 after his death.