Kostakis

Modern Greek diminutive of Kostas, as it contains the modern Greek diminutive suffix -άκης (-akis). This name is typically only used informally, meaning: it does not appear on birth certificates. A known bearer of this name is the Greek Cypriot soccer player Kostakis Artymatas (b. 1993).

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- https://en.wiktionary.org/wiki/%CE%9A%CF%89%CF%83%CF%84%CE%AC%CE%BA%CE%B7%CF%82 (in English; this is about the name)
- https://en.wikipedia.org/wiki/List_of_diminutives_by_language#Modern_Greek (in English)
- https://en.wiktionary.org/wiki/-%CE%AC%CE%BA%CE%B7%CF%82 (in English)
- https://www.quora.com/What-does-the-Albanian-name-Kristaq-mean (in English; I am putting this one here for the sake of comparison, as it mentions other modern Greek diminutives)
- Kostakis Anthopoulos (1835-1902): https://en.wikipedia.org/wiki/Constantine_Anthopoulos (in English)
- Kostakis Artymatas (b. 1993): https://en.wikipedia.org/wiki/Kostakis_Artymatas (in English)
- Kostakis Koutsokoumnis (1956-2018): https://en.wikipedia.org/wiki/Costakis_Koutsokoumnis (in English)
- Kostakis Pierides (b. 1940): https://en.wikipedia.org/wiki/Kostakis_Pierides (in English)
- Kostakis Antoniadis (died in 2015): https://el.wikipedia.org/wiki/%CE%9A%CF%89%CF%83%CF%84%CE%AC%CE%BA%CE%B7%CF%82_%CE%91%CE%BD%CF%84%CF%89%CE%BD%CE%B9%CE%AC%CE%B4%CE%B7%CF%82 (in Greek)

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(Information from name #301791 originally submitted by user cassilda in carcosa)