Does a Contacts Nickname transmit to anyone else; iMessage or email? iOS 9.0.2

So I asked Siri to call me Sugar Daddy... Hilarious, right?

Well I was using the e-mail app this morning, and when looking at a few e-mails I sent last night, I noticed that my name was put as "Sugar Daddy" in those e-mails as well. I then realized that Siri had put "Sugar Daddy" as my nickname (while retaining my real first and last names) in Contacts and that the e-mail app displays the nicknames of contacts.

Is there any chance the people I sent e-mails to also saw my name as "Sugar Daddy" in the sender field? At least one of them uses iOS himself. Please tell me this is not possible... I realize this is unlikely, but I just want to make sure.

Btw, I'm honestly not trolling, this seriously happened to me.
I had to laugh - but there's a serious question here, for sure. 

Does a nickname in your Contacts show to anyone else?

Empirically, I would say no - neither a nickname you give yourself nor any other contact will be transmitted.
My partner &amp; I have each other listed in Contacts with the nickname "ICE" [In Case of Emergency] yet it doesn't show up in any messages or emails we send to each other.
Similarly, my own nickname of Tetsujin is not seen by others in any communication I send.

I'm pretty sure you're safe asking Siri to call you Sugar Daddy… unless she does it in public, or if you ever intend to pass your vCard to someone, because it certainly will be in the exported card  ;)