Because he was curious about everything, knowledgeable and a gourmet, Yamamoto was nicknamed 'Nandemo Kajiro' (literally, chew anything, a pun on the verb to chew, which is pronounced like his name Kajiro).
非常に好奇心が強く、博学で、グルメでもあったため、姓名をもじって「ナンデモカジロウ」とあだ名された。