Although the mythological name Eos originates with a female figure, the Greek Titan of the Dawn, it is occasionally used for males.

Multicultural Names

Greek Names

Greek Names for Girls

3 Letter Girl Names

Names Ending in S for Girls

Names That Mean Dawn

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Names That Mean Nightingale

Greek Names that Start With E

Eos -- that's pronounced with a short e like eros without the r -- is the Greek Titan of the dawn.  Any ancient name with a sleek modern feel has definite revival possibilities.  Eos could be an inventive way to honor grandma Dawn. 
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Eos is also a Welsh bird name that is occasionally given to girls in Wales — pleasingly the nightingale, so this name covers both morning and night.

Mythological Names for Girls

Day Names

Goddess Names

Greek Mythology Names (with Meanings and Popularity)

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Unique, Rare, and Unusual Girl Names

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Girl Names That End in S

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Greek

Nameberry

Eos

Eos Origin and Meaning