His childhood name, 'Umunosuke' meant 'there is a person or none, who is as bold as me in this world' and 'Munizo' means 'there are no two or three people in this tenka (country) as bold as me.'
幼名の「有無之助」は「俺ほどの豪傑が世の中に有るか無いか」という意味で、「無二三」とは「俺ほどの豪傑は天下に二人も三人も居ない」という意味で名乗ったという。