Three syllable, classic, cute nickname, works in [name]Sweden[/name]. For a boy how about [name]William[/name]? Very classic, timeless, not trendy at all. Nickname could be [name]Will[/name], [name]Wills[/name], [name]Willy[/name], [name]Liam[/name], etc. For a girl I love the suggestions of [name]Katherine[/name] ([name]Kate[/name], [name]Katie[/name], [name]Kit[/name], [name]Kat[/name]) and would also suggest [name]Margaret[/name]. It has SO many nickname possibilities, is classic and pretty. Nicknames could be [name]Meg[/name], [name]Maggie[/name], [name]Margo[/name], [name]Greta[/name], [name]Maisie[/name], [name]Daisy[/name], [name]Peggy[/name], etc. Other options:
[name]Caroline[/name] - [name]Carrie[/name], [name]Caro[/name], [name]Carly[/name]
[name]Georgina[/name] - [name]Georgie[/name], [name]Gigi[/name], [name]Gina[/name]
[name]Josephine[/name] - [name]Josie[/name], [name]Jo[/name], [name]Fee[/name]
[name]Helena[/name] - [name]Nell[/name], [name]Nellie[/name], [name]Leni[/name], [name]Lena[/name]
[name]Louisa[/name] - [name]Lulu[/name], [name]Lou[/name]
[name]Matilda[/name] - [name]Tilly[/name], [name]Matty[/name], [name]Tilda[/name] ([name]Love[/name] this name a lot!)
[name]Rosemary[/name] - [name]Rosie[/name], [name]Romy[/name]
[name]Eleanor[/name] - [name]Ellie[/name], [name]Lena[/name], [name]Nora[/name]
[name]Gabrielle[/name] - [name]Gabby[/name], [name]Bree[/name]
[name]Frederick[/name] - [name]Freddie[/name], [name]Red[/name]
[name]Leopold[/name] - [name]Leo[/name]
[name]Edward[/name] - [name]Ted[/name], [name]Eddie[/name], [name]Ned[/name]
[name]Timothy[/name] - [name]Tim[/name]
[name]Theodore[/name] - [name]Theo[/name], [name]Teddy[/name]
[name]Christopher[/name] - [name]Kip[/name], [name]Topher[/name], [name]Chris[/name]
[name]Harrison[/name] - [name]Harry[/name]
[name]Nathaniel[/name] - [name]Nate[/name]
[name]Nicholas[/name] - [name]Nick[/name], [name]Cole[/name]
[name]Samuel[/name] - [name]Sam[/name]
[name]Zachary[/name] - [name]Zach[/name]
hope that helps!