There is another explanation that takuan-zuke was originally referred to as 'jakuan-zuke' meaning 'a pure thing' but, with Sosho TAKUWAN coming into the picture, it became commonly accepted that 'jakuan' evolved to 'takuan' and then 'it was invented by Takuwan Osho priest.'
元々『「じゃく」あんづけ』と呼ばれており「混じり気のないもの」という意味であったが、後に沢庵宗彭の存在が出てきたことにより、「じゃくあん」→「たくあん」→「沢庵和尚の考案したもの」という考え方が広まったという説もある。