Cyrillic is at least partly derived from the Greek alphabet, yes. https://en.wikipedia.org/wiki/Cyrillic_script https://en.wikipedia.org/wiki/Cyrillic_script

Cyrillic is at least partly derived from the Greek alphabet, yes. https://en.wikipedia.org/wiki/Cyrillic_script https://en.wikipedia.org/wiki/Cyrillic_script > Cyrillic is derived from the Greek uncial script, augmented by letters from the older Glagolitic alphabet, including some ligatures.