Please help pick a sibling name...

AK

My son is Rayven Midnight and my daughter is Wren Sapphire. I want to carry on the bird theme, I don't like Robin. Both middle names are 8 letters and themed around blue. Midnight blue Sapphire blue so would like to continue that also but can't think of anything.

Unsure of gender at the moment but both names used are unisex.

Rayven spelt with a Y as he is named after my dad Ray.