There was actually a steemit tag #steemitnamechallenge a few months ago that went viral and we had many many steemians joining and sharing the story behing their username. The rules include

1. Tell us in a post how you chose the current Steemit username you have. The story behind it.
2. If you could change your current username, which name would you choose and why? If you have a possible usernames list, mention it!
3. Use the tag #steemitnamechallenge so that the creator of the challenge can track all the posts and check them out
4. Nominate 5 people for this challenge

And here is my story

@jrvacation is owned by both of us. J writes the contents and R manages the technical and financial aspect of the account. Back in 2013, when we wanted to start blogging on our Japan Travel experiences, first thing we needed to do was to obtain a domain name. We decided to choose the first letter of our firstname, forming JR. Next, we tried different combinations like JRTravel.com, JRHoliday.com, but all of those were already taken up. We absolutely wanted a .com domain, and in the end JRVacation.com was chosen. The name stucked and we had been using it on our website, FB, instagram, and now Steemit!
JR also sounds like Japan Rail (the national railway in Japan) which is synonymous to our blogging topic.