Sophia and
Julia go together well, and both are legitimate names that will age with their bearers gracefully. Adelynn? Not so much. It dumbfounds me why your friend decided to use legitimate names for two of the three but not the third.
Sophia and
Julia were lucky to get the good names of the bunch; it's sad that Adelynn was left out.
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My favourite name combinations:
Katherine Virginia (f)
Alexandra Caroline (f)
Frederick Samuel (m)