Dog is cute - love the ears!!! (Also love your son's Star Wars shirt lol).
We have also always changed our dogs' names when we adopted them - no problem. My one dog has about a million nickname variations on his name, some that have evolved so far away from his original name we forget how we got there; but its ok he's cool with all of them lol.
My little handful backup dog is named Daisy, and gets called "Crazy Daisy" so often she responds to the word crazy all on its own too. For example, we can be in the room discussing something totally unrelated, such as "Wow the plot of that movie was just so crazy." And then we here the thump thump thump of her tail hitting the floor as she looks up at us quizzically. Then we have to be like "No, no, not talking about you, go back to sleep" lol.
Love dogs so much!!! They will adapt to whatever name you give them. Just give them a lot of love.