Biodun556:
https://en.m.wikipedia.org/wiki/Giannis_Antetokounmpo

Giannis Adetokunbo was born in Athens, Greece, on December 6, 1994, the son of immigrants from Nigeria.Three years earlier, his parents had moved from Lagos, leaving their firstborn son, Francis, under the care of his grandparents. Adetokunbo grew up in the Athens neighborhood of Sepolia.His parents, as immigrants, could not easily find work, so Giannis and his older brother, Thanasis, helped by hawking watches, handbags and sunglasses in the streets. In 2007, Adetokunbo started playing basketball.

Although Adetokunbo and three of his four brothers were born in Greece, they did not automatically receive Greek citizenship as Greek nationality law follows jus sanguinis (right of blood ). For the first 18 years of his life, Adetokunbo could not travel outside the country and was effectively stateless, having no papers from Greece or Nigeria. He was eventually issued Greek citizenship on May 9, 2013,[14] less than two months before the 2013 NBA Draft.

After gaining Greek citizenship in 2013, his official surname became Αντετοκούνμπο, the Greek transcription of Adetokunbo, which was then transliterated letter-for-letter and officially spelled on his Greek passport as Antetokounmpo.[15][16] Giannis is the colloquial for the Gr. Ioannis (John).[17] Because many could not pronounce his surname, he quickly became known as the "Greek Freak".[18][19] Antetokounmpo obtained Nigerian citizenship in 2015[1], as such Antetokounmpo possesses multiple citizenship (being both a Greek national and a Nigerian national)

After gaining Greek citizenship in 2013, his official surname became Αντετοκούνμπο, the Greek transcription of Adetokunbo, which was then transliterated letter-for-letter and officially spelled on his Greek passport as Antetokounmpo