How about Roscoe ?
I agree with ChewyGeorgia, you can wait til he comes home and you spend some time with him, a name might come to you......
...or if you're still drawing a blank, you can Google "puppy names", and about a hundred gazillion will come up.
Don't sweat it !!! You'll do fine. The right name for your pup will make itself apparent soon enough. Have fun with it !!!