[Spoiler if you are more than 1 or 2 year late] About the name Kurosaki.

A question popped in my mind last night : how does the last name system works in Japan/Asia when 2 people marry. In most western culture, the wife changes her last name for her husband's, or keep it, or takes both. But I've never heard of the husband changing his last name. However when we look at Isshin and Masaki, his last name was Shiba, and hers was Kurosaki. After they got married, Isshin was called Kurosaki too. I know that for hiding reasons, it was a more convenient choice, but is it something common in Japan, or did Isshin say something like "I have no last name plz give me one"?