How about Pieces? That way you can have Reese's & Pieces.
I say this to be funny, but I work in the vet field & people do have themed type names. You could also name him Snickers- but that is a popular name & not one usually associated with a retriever. I have seen them named after TV show characters, cars, beers, liquor, spices etc.
You could also go with another name that starts with R.
I personally like to wait to see what fits their personality & what they respond to. But I too like different names.
IF he has a quality you like that you want reflected in the name- & english doesn't fit the look for the same name in a different language.
Currently we have 3 cats.
Tangelo- orange tabby (husband calls him Orenthal after OJ Simpson)- Don't ask- hubby has a weird sense of humor.
Pyro- a flame point Siamese- also has a fire personality.
Gina- who is a beautiful snowshoe/tortie point siamese- named after the actress Gina Lollabridgida. We wanted something to indicate princess- which my 3.5 yr old calls her a princess kitty, but princess in other languages did not sound right.
BTW- all of mine were rescues through our local emergency clinic.