贱称

• 貝(shell; currency)RADICAL
• 戔(small; few)PHONETIC

Money and valuables are considered small and cheap, so the character means contemptible and lowly.

• 禾(rice plant; grain stalk)RADICAL
• 尔(you)PHONETIC

A rice plant being weighed and measured gives it a name, thus meaning "to address" or "to call by name."