Are these more common for girls than guys in the US, because here Cyan, Indigo, Azure and Teal are seen as mostly feminine (although unisex)?Some other boyish blues:BondiCambridgeDodgerDukeMidnightPrussianRoyalSkyTrueYaleZaffre
Yes, they are more common for girls. Cyan is 38f/8m, Indigo is is 61f/20m, Azure is 43f/15m, Navy is 21f/5m, and Teal is 10f/6m. Slate is all boy. Still, all are so unusual that I don't think they have a particularly strong gender association.
I consider Indigo more of a male name than a female one, even though it's also more widely used as a female name here in England&Wales.
They don't have a very strong gender association here either, apart from Indigo - we had a high-profile celebrity baby called Indigo 3 years ago, and ever since then it's become semi-popular and definitely feminine.I agree with Lou - to me it seems male, even though it's much more common as a female name.It annoys me that if a celebrity decides a particular name is male or female, then that's it - can't we think for ourselves any more?