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Why did many Jews in Alexandria use Greek instead of Hebrew?

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Philo Judaeus Jewish philosopher Philo Judaeus.

The transition of the Jewish community in Alexandria to using Greek instead of Hebrew was primarily a result of the extensive process of Hellenistic acculturation that occurred following the city's founding in the 4th century BCE.12

As Alexandria became a major center of Greek culture, scholarship, and trade under the Ptolemaic dynasty, Greek emerged as the common language throughout the region. By the end of the 3rd century BCE, the large Jewish population in Alexandria had become significantly Hellenized. This shift is evidenced by the fact that, after the 3rd century BCE, nearly all Jewish papyri and inscriptions in Egypt were written in Greek rather than Aramaic or Hebrew.34562

The adoption of Greek was a practical necessity for daily life and social integration within the broader Hellenistic society. This cultural shift also necessitated the creation of the Septuagint, a Greek translation of the Old Testament, which allowed Greek-speaking Jews to access their religious texts in the language they used most fluently.632