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@IlDiavolo
Buddha is the guy whose teachings were taken to create Buddhism.
Wrong he was simply the first official Buddha, others may have been before him unwittingly especially some Hindus, based on logic of what a Buddha is.
While alive he was the first boddhisatva:
In Buddhism, mostly generally speaking, a bodhisattva[a] or bodhisatva is a person on the path towards bodhi ('awakening') or Buddhahood.[1][2] Often, the term specifically refers to such a person who forgoes or delays Nirvana or bodhi in order to compassionately help other individuals reach Buddhahood.
His name was Siddhartha Gautama. The 'tha' is said as tah.
He is nicknamed The Buddha but this is misleading.
The title of "Buddha" is most commonly used for Gautama Buddha, the historical founder of Buddhism, who is often simply known as "the Buddha". The title is also used for other sentient beings who have achieved awakening or enlightenment (bodhi) and liberation (vimokṣa), such as the other human Buddhas who achieved enlightenment before Gautama; members of the Five Buddha Families such as Amitābha; and the bodhisattva Maitreya, known as the "Buddha of the future who will attain awakening at a future time."In Theravāda Buddhism, a Buddha is commonly understood as a being with the deepest spiritual wisdom about the true nature of reality, who has transcended rebirth and all causes of suffering (duḥkha). He is also seen as having many miraculous and magical powers. However, a living Buddha has the limitations of a physical body, will feel pain, get old, and eventually die like other sentient beings. In Mahāyāna Buddhism, any Buddha is considered to be a transcendent being with extensive powers, who is all-knowing, immeasurably powerful, with an eternal lifespan. His wisdom light is said to pervade the cosmos, and his great compassion and skillful means are limitless. This transcendent being is not understood as having a normal physical human body; instead, Mahāyāna Buddhism defends a kind of docetism, in which Gautama Buddha's life on earth was a magical display which only appeared to have a human body.