East Sea on your Website is written Mar de Japan.
I can not know why you chose the name 'Mar de Japan' instead of Dokdo, but I want to say that your choice of Dokdo's name was wrong. I'll tell you the reason first.
For this reason, Japan asserts East sea should written by Sea Of Japan.
The incidence is much more use of the named Sea Of Japan since the 19th century on this map seoyanggo. This nomination has been established in the world and the Sea of Japan, the name of Japanese imperialism, colonialism doesn't matter which means that therefore any other other than the Sea of Japan.Name will also not appropriate.
But this is a false claim.
Historically, many geographical names have been used in this area, but nothing has been established. For a long time, on a map western old man was written the East Sea as East sea, South Korea and Sea of Japan. Adiitionally many Western map doesn't write anyting.