The reason it doesn't have an Alif/aa sound is that the Arabic version is based on a more French pronunciation of the name Bob, not an English one, which is more of an "oh" sound. The influence of France on Arabic has to do with its history in the area.
We have a choice of "Bob Judy", which is considered correct, but the answer should be "Bob and Judy." However, "and" is not included in the word bank. I reported it as "My answer should not be accepted."