apple watch activity name change

the name of my apple watch (series 1) is Paul's apple watch. It is in the section of watch app on iPhone under my watch, general, name. However when I reach an activity goal the watch calls me charles (not my watch name). The only Charles in my contacts is my insurance agent under the insurance name.

And the next day after I reach a goal, my watch calls me charles and wishes me success the next day.

How to I fix this to be my name and not Charles???