Add a second middle name? (Pls read description)

My husband and I are set on Reuben for our son’s name. It’s a lovely Hebrew name and my husband is Jewish. We are also set on Jeffrey as his middle name- it’s my dad’s and my grandpa’s name.

We have recently been throwing around the idea of adding another middle name. Something my husband and I have in common is that we both actually have 2 middle names. It would be kind of special to pass that on to our son! The name we’ve been thinking about adding is Lars. It doesn’t have as much meaning as the other two but we both really like it. We both have positive associations with the children’s book with the polar bear named Lars, that’s where we both got it from lol. Should we throw another name in there? If not Lars, any other suggestions? I also like Psalm but my husband is not on board with that one lol.