Can you help me with the name 아성?
My friend was teaching me Hangul and we started talking about names. She used 아성 as an example. I adore this name but can’t seem to find anything about it, it’s meaning, or even if it’s a name at all.. Can someone help?? :)
Thank you so much.

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I think 아성 is a pretty name. An Korean actress has this name, too.

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아성 is not a common word.
The most common usage of 아성 is in the sense of "bastion", as in 그의 오랜 아성이 무너졌다 (His long establish bastion has collapsed).

You can use it for a name as it doesn't have a bad association. But it is not a particularly common name.

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아성 has several meanings.
It commonly used as the meaning of "stronghold"

미국의 남부 지역은 공화당의 아성이다
The southern part of the United States is the Republican stronghold.

But, it seems that 아성 is just a semi-transliteration of your name "Ashton"