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From Latin ō̆ (vocative particle), probably influenced by Ancient Greek ὦ (ô, vocative particle). From Latin o (vocative particle). O (modal auxiliary, ? form of avea, used with ? to form ? tenses)

Irish

Fifteenth letter of the alphabet, from a character that in Phoenician was called ‘ain (literally «eye») and represented «a very peculiar and to us unpronounceable guttural» Century Dictionary. Eye dialect of ‘ô (“of the”, masculine singular), from the lenition of rhoticized, dialectal rô, from dô, from an earlier and standard dû. O (+ dative, triggers lenition, combined with the singular definite article on) (el/ea) o (modal auxiliary, third-person singular form of vrea, used with infinitives to form presumptive tenses) All possible mutated forms are displayed for convenience. From earlier lo, from Latin illum (the initial l having disappeared; compare Spanish lo, Italian lo).

• The Kashubian orthography is based on the Latin alphabet.
• Quick and reliable accounts of the origin and history of English words.
• O is used predominantly in the north of Wales, while e is used in the south, with fo and fe as variants of o and e respectively after a vowel.
• Accented O has a unique sound, and its usage varies depending on the language and context.
• Reduced form of go (“to go”).

You can also use this copy-paste method if your keyboard does not support accent shortcuts or alt codes. You can use the Insert Symbol function in Microsoft Word to insert the accented letters. To type Capital O with an accent you will just have to turn On Caps lock key and then use a similar shortcut. Typing O with an accent mark on a Mac can be done using keyboard shortcuts. Windows provides various alt codes for typing characters with accents, including the letter O with different accents.

Interjection

In English, there is also a «short» ⟨o⟩ as in fox, /ɒ/, which sounds slightly different in different dialects. The letter ⟨o⟩ is the fourth most common letter in the English alphabet. The letter was adopted with the value in the Old Italic alphabets, including the early Latin alphabet. Its original sound value was that of a consonant, probably ʕ, the sound represented by the cognate Arabic letter ع ʿayn. The name of the Phoenician letter was ʿeyn, meaning «eye», and its shape originates simply as a drawing of a human eye (possibly inspired by the corresponding Egyptian hieroglyph, cf. Proto-Sinaitic script). In most other languages, its name matches the letter’s pronunciation in open syllables.

Borrowed from Spanish o (“or”), from Latin aut. Reduced form of go (“to go”). See the Silesian language article on Wikipedia for more, and o for development of the glyph itself. The Silesian orthography is based on betjili the Latin alphabet.