The logo on the clothes of Konoha ninjas in Naruto

That is the symbol of the Uzumaki clan. Because the Uzumaki clan is distantly related to the Mori no Senju clan of the first Hokage, and they are both descendants of the youngest son of the Sage of Six Paths. Moreover, their two clans were still allies, and the first generation even married Uzumaki Mito, who later became the first jinchūriki of the Nine-Tails. So Konoha's uniforms still have the Uzumaki clan's mark on them.

There is also a fourth generation named Namikaze Minato, who is not from the Uzumaki clan. Her wife Uzumaki Kushina is. Naruto takes his mother's last name.