The boy would be named Philip. But that is beside the point. Would there still be a divorce and the whole church thing? The six wives?
First, there's no way that Henry would name his son Philip. No English monarch has been named Philip nor are any of Catherine's relatives named that. The name would be Henry, Edward or if U want a foreign name, John or Ferdinand, after Catherine of Aragon's brother and father, respectively.
Second, is there any reported cases of Leprosy reported in the British Isles, in either the royal line or noble families? Because I can't find any.
Third, with a surviving son, regardless of his condition, the Pope would be even less likely to grant a divorce than in OTL. Baldwin IV had Leprosy but he was still able to succeed to the throne and his parents did not divorce because of that reason. They divorced because the wife had no political value.