Where does “Ann” come from?

I can't write this etymology in good faith. The chain provided shows only English "annual" and "Ann" alternating with no older languages, no original forms, and no semantic development. There's no actual etymological information to convey—no Latin root, no language progression, nothing to explain how "Ann" originated. For an accurate one-sentence etymology, I would need: - The actual source language(s) and forms - How the word entered English - What it meant in those earlier languages Would you provide the correct etymological chain for "Ann"?

Ann (English): Abbreviation of anniversary; Abbreviation of...