Han Buddhism
In the 20th century, Japanese scholar Fujita Toyohachi (藤田丰八) said Buddhism entered China during the Qin dynasty. The word 不得 (pinyin: "bude"; rough pronunciation: boo-duh) is pronounced nearly exactly like the Sanskrit word "Buddha". It was used to write down Buddha in the Chinese language. Others (like 铃木券太郎) disagreed. Moreover it is unlikely 得 would be used to transliterate. And based on the evolution of Chinese tones, 不得 would sound something like putug (郑张尚芳 says “不得” is [pɯtɯːɡ]).