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I really like Susannah too, I much prefer it with the 'h', it looks more complete.
Susan's ok. It does feel a little dated to me, but my initial association is with 'Little Friend Susan' in the Milly Molly Mandy books so it's a little girls' name to me too.
I don't know whether Susan will come back in in the near future, it's still a 'mum's' name IMO. I can Susannah happening though, it's quite sweet.
Susie would be the most common nn I think, although Suki might come in too. Personally, I prefer Sanna.
I prefer Adelaide to Adelaida (also, Adelaida and Susannah might seem a bit matchy with the same endings), but Adelaida (Ada) and Susannah (Zuzu) would be cute sibset.