Name-value pairs shall be UpperCamelCased (PascalCased) and contain no numbers, both when using the arguments block and when using the inputParser function.
Rationale
Consistency in name-value pair naming improves readability of the code and predictability of calling syntax. Name-value pairs in MATLAB functions are UpperCamelCased as well, which means that user-defined functions are more easily integrated with those as well.