As girl's names go, a northern one? (3)

I believe the answer is:

nan

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'as girl's names' is the definition.
I can't judge whether this defines the answer.

'a northern one?' is the wordplay.
'a northern' becomes 'n' (abbreviation e.g. N. Ireland).
'one?' becomes 'an' (an apple is one apple).
'n'+'an'='NAN'

'go' is the link.

Can you help me to learn more?

(Other definitions for nan that I've seen before include "Indian bread - older relative" , "Elderly relative" , "type of slightly leavened bread" , "Granny; bread" , "Relation" .)

I've seen this clue in the Evening Standard.

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