Any instance in the pali canon where a sotāpanna born as a human?
AN 3.87 didn't provide any specific instance but in this sutta, the Buddha talked about 3 grades of stream enterers from low to high:

...Having undertaken the training rules, he trains in them. With the utter destruction of three fetters, he is a seven-times-at-most attainer who, after roaming and wandering on among devas and humans seven times at most, makes an end of suffering;
With the utter destruction of three fetters, he is a family-to-family attainer who, after roaming and wandering on among good families two or three times, makes an end of suffering;
With the utter destruction of three fetters, he is a one-seed attainer who, after being reborn once more in human existence, makes an end of suffering.