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 Doron mean?
From the Greek word doron 'gift', adopted into Hebrew and now used chiefly in Israel. Directly means 'gift'; predominantly masculine but occasionally unisex.