Being the root of Ciara and Ciaran I'd say this is a great candidate to becoming a unisex name if it isn't on the path towards that already. It even stems from an adjective, which are not gendered in any Gaelic language, so making it a feminine name for a dark-haired baby wouldn't be grammatically wrong.
― Anonymous User 5/29/2022
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To expand on the meaning/usage of the name, Ciar (Kee-er) also exists as a word in Scottish Gaelic. It is the adjective for 1. Dusky, gloomy, 2. Dark, swarthy, 3. Dun. It is also the verb for darken. Both are spelled and pronounced the same. So the name translates into Scottish perfectly.
― Anonymous User 5/29/2022
2
There is a yummy South Asian rice pudding dish called Kheer which sounds exactly like how Ciar is pronounced (KEER).
― Anonymous User 4/19/2015
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I really love this name! It has to be one of my favorite names. I will definitely have this noted for if I have any children.