Dominic okay. I knew two in primary school.
Domnic looks weird, like you've forgotten the i, and it would be said just DOM-nic instead of DOM-uh-nic so it's a slightly different name anyway (I don't like it.)
Nicknames is hard, because I think
Dom sounds kind of stupid, and I'm not a fan of
Nic either. What about
Don? It's not much of a stretch..
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Sol Santiago,
Indigo Makaio, Aila
Celandine and
Saskia Autumn (Saska)