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 Ari mean?
From Hebrew ari (also aryeh), 'lion.' A short modern Hebrew name; distinct from the theophoric Ariel ('lion of God'). A concrete noun — its strength associations are connotation, not etymology.