Insubrium etymology

Hello

I would like to propose you one hypothesis about the Celtic tribe
etymology "Insubre" from Cisalpine and Eduen membership = pagus
Insubrium
I found the Irish term "Saibhir" = Rich/ Wealthy and may be the Manx
Term "Souyr (Comfortable)

The translation will be for Insubre « People who live in wealth" ?
If Celtic Subr- can give Irish Saibhir ?
But I have no found connection in brittonic

What do you think ?