Mr. Sugino(杉野洋明), who found 1906's Korean news paper article, which omits Dokdo from Uldo County (皇城新聞 「鬱島郡의 配置顛末」) found new hint for the identity of 石島(Seokdo) in Imperial Edict No.41 in 1900 (大韓勅令第41号) .
According to the article he found this time, there were some Buddha shaped stones (石仏) on Kwannondo(観音島) , and it was started to be called the island as "観音島" later.
As you know, 観音（Kwannon）, or 観音菩薩(Bodhisattva Avalokitesvara) is one of the Bodhisattva(菩薩). Technically, Bodhisattva is different from Buddha(仏) itself, but it is sometimes used as one of Buddhas.
Read more about the article : ★大韓帝国勅令41号の「石島」の正体は・・・(Japanese.)