Was just browsing the one piece wiki and found something:
It is an interesting point. Though it has to be pointed out that Sommer is a widespread surname. This might just be concidence, but it is too fitting to ignore.
He crucified priests!!! Kuma is a priest. Sommers has thorn powers (Jesus was of course crowned with a crown of thorns)...
one piece wiki said:
Sommers shares his surname with the English privateer George Somers, who was also a knight and considered a naval hero for his colonization efforts.
- He also shares a surname with Martin Sommer, an infamous Nazi war criminal known for his brutality and sadism.
Wikipedia said:
Sommer, known as the "Hangman of Buchenwald", was considered a depraved sadist who reportedly ordered two Austrian priests, Otto Neururer and Matthias Spanlang, to be crucified upside-down
