Years ago we had a litter of labs - 5 yellow and 5 black. We kept two of the pups naming the black lab Thunder and the yellow lab Lightning. A few years later we got another yellow lab and named her Sunshine. Naturally when we got our kitten we had to name her Hurricane.
We couldn't think of a "weather" name when we got a new black lab pup last year, so we named him Duke. It just seemed to fit.