No I don't really know the meaning of it but that's the official name of the Sinnoh League from anime and it sound cool, so I thought why not use it?
There's rumor going on that Ash and Pikachu will be gone in next Pokemon anime starts in Fall 2010 in Japan which means this will be last league Ash and Pikachu will be participate.
I'm sure, many of the Pokemon fans started becoming fan by watching Ash and Pikachu's adventure and it could be coming to an end.
So I thought we should make a league name as same as anime as an homage to Ash and Pikachu because that's how we all started being fans of the Pokemon.
Because we might never see them again and this Sinnoh League Suzuran Tournament Ash and Pikachu will participate could be last league their going to participate.
So that's how I decide upon a name, to cheer Ash and Pikachu and hopefully they can be champion of the Sinnoh League.
You probably think it's lame but I don't know... Ash and Pikachu was always this big things to me and I personally think their the face of the Pokemon.
Anyway that's why I wanted to name the league by that name but it's up to you to decide if you're going to use it or not. ^^