What does Reuben mean?
Hebrew Re'uven, literally 'behold, a son!' (re'u 'see, behold' + ben 'son'). Genesis 29:32 layers a second biblical wordplay on it: Leah says 'the LORD has looked upon (ra'ah) my affliction' — that play is theological rather than the strict etymology.
What does Zev mean?
From the Hebrew 'ze'ev' (זְאֵב), meaning 'wolf'. In Jewish tradition it is associated with the tribe of Benjamin, described in Genesis 49:27 as a wolf; often paired with the name Benjamin.