Gwyneira

I'll preface this by saying I'm Welsh. This name doesn't mean "white snow", it means "snow white". Welsh is "backwards" to English, so while gwyn means "white" and eira means "snow", it doesn't read that way just because you mash them together as Gwyneira. Welsh naming/language conventions work differently; as I said, Welsh is "backwards" to English, so in order for this name to mean "white snow" it'd have to be Eirwen (which is a genuine Welsh name that predates Gwyneira).

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"Gwyn" also tends to be the masculine form of the word, where as the feminine is "gwen" — as seen in feminine names like Gwendolen, Gwenllian, and Gwenhwyfar. The only exception is Gwyneth and that's because it evolved from Gwynedd, the name of a Welsh kingdom, rather than being created from the element of "gwyn".

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This name honestly reads like an English speaker made it up with no knowledge of typical Welsh naming conventions. It'd stick out to me as a Welsh person living in Wales. For that reason, my own preference is Eirwen. I wouldn't like to name my child "snow white".

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If Gwyneira is your jam, that's cool - but for those who are living in Wales, or who do care about the meanings of the name, I would take into consideration the structure of this name.