Kosić is a family name from the Balcans.

It is also the name of several villages in Montenegro (3), Bosnia (2-3), Croatia (1-2) and Serbia (1). Sometimes it is in plural (Kosići).

Links: "Kosic" at FallingRain.com
and "Kosić" at FallingRain.com

Косичі (Брянська область)

Kosić means "a little Blackbird" ("kos", "kosić").

It is related to "mowing" ("kosidba", "kositi").

There is also connection to "hair" ("kosa").

Polish, poljski

Idem kositi travu...

Danas ima drugačije značenje.

I'm going to mow the grass...

Today it has a different meaning.

"Kosić" at Wiktionary

Kosic group at Facebook

In Albania there is a family name Kosiqi, but we don't have any evidence of relation yet.

There is no connection to the Greek island of Kos.

ActaCroatica.com/Kosić

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"Косићи у Благају и Ходбини (Бишће, Мостар). У Ходбину је Косић 'прешао на женинство' из Благаја.
Косићи су у Укшићу (Љубомир) и у Требињу. У Укшић су доселили из Мокрина у Боки Которској око 1880. године. Презиме је могло настати од женског личног имена Коса (Косара, Косина). У Укшићу је 1970. године била једна кућа Косића. У Требиње су дошли из Укшића. Славе Ђурђевдан."

Из књиге "Херцеговачка презимена",
Ристо Милићевић, Београд 2005.

Translation:

Kosići in Blagaj and Hodbina (Bišće, Mostar). In Hodbina, Kosić "switched to wife's property" from Blagaj.
Kosići are in Ukšić (Ljubomir) and in Trebinje. They moved to Ukšić from Mokrine in Boka Kotorska around 1880. The surname could have originated from the female personal name Kosa (Kosara, Kosina). In 1970, there was a Kosić house in Ukšić. They came to Trebinje from Ukšić. They celebrate St. George's Day.

From the book "Herzegovinian surnames",
Risto Milićević, Belgrade 2005.

That's my family, from Ukšić and Mokrine (village Svrčuge, Sutorina, Boka Kotorska).

We belong to I2a (I-P37) Y-DNA haplogroup.

Genetic test at FamilyTreeDNA (Y-chromosome) connected me among others to a person in Poland with the family name Kozak.
Etymology: Borrowed from Ukrainian "коза́к" ("kozák", “Cossack”), ultimately from Proto-Turkic "qazāq" (“free man", "adventurer”).

• en.wiktionary.org/Kozak
• encyclopediaofukraine.com/Cossacks
• en.wikipedia.org/wiki/Cossacks
• familysearch.org/Kozak
• 30% of modern day Cossacks have haplogroup I (sub-haplogroups I1 and I2). (familytreedna.com)