Why is "is going to" being used here? Does the meaning of this sentence change if I use "was going to" instead?
"Is going to" is used here because this expresses future tense and he is talking about the her children being named in the future. If you used "was going to" instead, it would imply past tense and express that the children were going to be named after a snack or a baked good, but they didn't end up with these names. It would not be correct to use "was going to" here because she has not had children and so past tense would not make sense. Here's another example of "is going to" and "was going to": Ex: He is going to give me a call when he is done working. Ex: He was going to give me a call, but now he is busy.