Board Thread:General Discussion/@comment-24510002-20170626125633/@comment-28224025-20170704202612

I know! He could change his name to something like  松影  天魔 (MatsuKAGE TenMA)

影 (Kage) means Shadow

天 (Ten) means Sky/Heaven

The (馬) Ma/Ba in Tenma's name means horse or something. so Tenma means Sky/Heaven Horse or Pegasus, but 魔 (Ma) would mean Demon/Devil

So Dark Tenma's name would be something like Sky Demon/Nightmare!