许慎

许慎	Xǔ Shèn	Xu Shen (-147) the compiler of the original Han dynasty dictionary Shuowen Jiezi 说文解字
许	Xǔ	surname Xu
许	xǔ	to allow / to permit / to promise / to praise / somewhat / perhaps
慎	shèn	careful / cautious
慎	shèn	old variant of 慎