really stuck on a name for our baby girl

we have a 2 year old boy called Santiago which in the uk is quite uncommon so I want a name that goes well alongside it - the middle name is going to be hannah after my mum! Emmeline was our absolute favourite but I recently met 2 others where it was shortened to Emma and Emme and it’s completely put me off! Beatrice is husbands favourite! and Belle is what I have called my bump since the beginning! what are your opinions!!