Middle names

Katt

So my family hates what my husband and I have come up with for a boy. It took us forever to agree and once we finally found it I was excited and then my sister literally trashed it and said it wasn’t it 🙄 we will still use it and she can suck it …. But she called it a wimpy name…. So anyway now I need help finding a middle name to go with Sullivan. We’ve considered Sullivan Arthur. I’m also not opposed to unique middle names!