How to say "let's start using our first names when we talk?"


I think that there are a lot of societal influences with regard to how to
begin addressing a Japanese man with his first names. Please put the societal
issue aside and just consider the linguistics of this scenario.

  * Both the Japanese and American are speaking in Japanese.
  * Both the Japanese and American are men. 
  * In formal and informal settings, a Japanese addresses me using my first name.
  * I address the Japanese using his last name.
  * During the first few weeks / months of getting to know him, he uses my first name and I use his last name. I can't remember how it happened, but I've been speaking to some Japanese men using their first names for awhile.
  * I prefer using his first name if I consider him a close friend and if he has no problem with it. But, in the presence of another Japanese person, I would never say his first name. 

When I think the time is right (which is not this question), how would I
express this thought in Japanese? The context is an American saying it to a
Japanese.

> Hey Tanaka-san. Is it cool If I start using your first names?

I would say something like

> 悪いけれども、これから、下のお名前を使わせて頂いても、宜しいんですか？

Is that ok? I am sure it sounds very unnatural, but even asking to use his
first name is unnatural. So, what should I say?

By the way, my observations are that, even when best of buddies, Japanese men
always address each other using last names. And, the norms for addressing
Japanese women with first names are completely different.




How about:

> ([今度]{こんど}から)[下]{した}の[名前]{なまえ}で[呼]{よ}んでもいいですか。(a little casual)  
>  下の(お)名前で呼ばせてもらってもいいですか。/[構]{かま}いませんか。(more polite)  
>  下のお名前で呼ばせていただいてもいいでしょうか。/よろしいでしょうか。(even more polite)

etc...




How about:

> ([今度]{こんど}から)[下]{した}の[名前]{なまえ}で[呼]{よ}んでもいいですか。(a little casual)  
>  下の(お)名前で呼ばせてもらってもいいですか。/[構]{かま}いませんか。(more polite)  
>  下のお名前で呼ばせていただいてもいいでしょうか。/よろしいでしょうか。(even more polite)

etc...

