Okay, Alasdhair (more unusual family spelling than this but changed to avoid accidental outing) is new DS's name. DD (3) is calling him Alice. When discouraged from this it is Allah.
Obvs neither ideal. Awkwardly we're not mad keen on Al or Ali. Initials are AHSH, but one of DD's close friends is Ash, tho' I could be persuaded into Ash.
Any ideas?