As prophesied by Swami Samarth, after 21 years after the burial of the icons, a mandar tree grew at that spot with a svayambhu Ganesha in its branches.
The name Soyombo is derived from the Sanskrit word Svayambhu(meaning "created out of itself").
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If the word Svayambhu is pronounced in Bengali, it will be pronounced Shoyombhu; Soyombo sounds much similar to that.