That's the symbol of the whirlpool clan. Because the Whirlpool family and Huo Ying's first generation Mori Naomi family are distant relatives, and they are both descendants of Ootutuki Hagoromo's youngest son. Moreover, the two families are still allies, and the first generation married Uzumaki Mito, who is the first generation in Kyubi no Youko. Therefore, Konoha's uniform still bears the imprint of the whirlpool clan.
There are four generations called Namikaze Minato, not the Whirlpool family. His wife Uzumaki Kushina is. Naruto was named after his mother.