Final answer:
The name that is used for both genders and has the smallest difference in which gender holds the name most frequently is Alex.
Step-by-step explanation:
The name that is used for both genders and has the smallest difference in which gender holds the name most frequently is Alex. Alex is a unisex name that can be given to both boys and girls. It is a short form of names like Alexander or Alexandra. While it is difficult to measure the exact frequency of the name, the name Alex is commonly chosen for both genders.