[name_f]Sienna[/name_f] …
last name is one syllable simple last name.
[name_f]Sienna[/name_f] [name_f]Elizabeth[/name_f]
[name_f]Sienna[/name_f] [name_f]Claire[/name_f]
[name_f]Sienna[/name_f] [name_f]Rosalie[/name_f]
[name_f]Sienna[/name_f] [name_u]Halley[/name_u]
[name_f]Sienna[/name_f] [name_f]Penelope[/name_f]
[name_f]Sienna[/name_f] [name_f]Alexandra[/name_f]
[name_f]Sienna[/name_f] [name_f]Gabrielle[/name_f]
[name_f]Sienna[/name_f] [name_f]Evangeline[/name_f]
[name_f]Sienna[/name_f] [name_f]Isabelle[/name_f]
Off the top of my head, that’s what I thought of.
[name_f]Sienna[/name_f] [name_f]Rosalind[/name_f]
[name_f]Sienna[/name_f] [name_f]Clementine[/name_f]
[name_f]Sienna[/name_f] [name_f]Iris[/name_f]
[name_f]Sienna[/name_f] [name_f]Beatrice[/name_f]
[name_f]Sienna[/name_f] [name_f]Alice[/name_f]
Gorgeous choice 
[name_f]Sienna[/name_f] [name_f]Claire[/name_f]
[name_f]Sienna[/name_f] [name_f]May[/name_f]
[name_f]Sienna[/name_f] [name_f]Beth[/name_f]
[name_f]Sienna[/name_f] [name_f]Alyson[/name_f]
[name_f]Sienna[/name_f] [name_u]Evelyn[/name_u]
[name_f]Sienna[/name_f] [name_f]Marie[/name_f]