Last girl in a series named annually (4)

I believe the answer is:

june

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'last girl' is the definition.
'June' can be an answer for 'girl'. I'm not certain of the 'last' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for june that I've seen before include "Month of our summer solstice" , "Spring/summer month" , "Month after 14" , "Sixth month" , "The "flaming" month?" .)

I've seen this clue in The Times.

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