Google translation is okay to convert proper names in roman characters.
Now about fakes names, there's a lot of jap websites for Clubs, I'm also very used to search all players from every countries even Oman or Lebanon NT.
The trick is to found the date they started to play : when it's a playable team it's corresponding for example is the game is out in april 2008 to September-December 2008.
Now, if it's a hidden team from a qualification stage.
Example for PES 2008 it correspond to 2005-2006 rosters as the qualifications for Asia or WC started there. Also, if you see 180cm 80kg or 175cm 75kg for asian : it's often a "by default" value when there's no information about the player in question.
i planned to do it for WE 2008 but i'm on something else. For JL2008 it's easy as back numbers corresponds to all 2007-2008 AFC rosters when they started.
Not hurry to search it as it needs one afternoon to correct them.
It's quite simple if you open and decrypt in hexadecimal once you understood lines about players, just to correct names : you can copy paste a whole team over PES United or any team free or not just to to check, modify if you want and re-import the player on his club or nation hidden.
About PES shop Names it's pretty easy to found by copy paste some japanese fake name and for some players and google should give you links with translated players vs fake like here :
https://weaponj2007cc.ninja-web.net/r-weshop-player.html
Here's the page (in japanese) where you can found all you need about JL2007. For others version it's on the left back : up to you to navigate around all links
https://weaponj2007cc.ninja-web.net/
Note : to have google results you need to copy and paste the game name in japanese characters like Jリーグ ウイニングイレブン 10 for JLWE10
or Jリーグ ウイニングイレブン 2007 クラブチャンピオンシップ for 2007
For the others 2008-2009-2010 just change the year as they share the same name. On many wiki you can found the game's original japanese names

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