JUST MY OPINION!!!
It might confuse you that I occasionally switch between Adelheid (which I thought it was Himaruya's canon name for Fem!Switzerland) and Amelie (which is a lovely name choice by
) for Nyotalia Switzerland. Sorry about that. It's just that there are so many potential names for any Nyotalia girl.
The drawbacks of using these names though is that there is already an abundance of Hetalia characters starting with the letter "A" . Say for Hetalia, there is already Antonio (Spain), Alfred (United States of America) and Arthur (United Kingdom). For Nyotalia, there is probably only two characters with the name possibly starting with "A", but I'll count Alice (Ah-lee-cheh) for Nyotalia Italy, as well as Alice (A-liss) for Nyotalia UK, and Amelia for Nyotalia USA.
Given names starting with the letter "V" is a great rare case (I think only Vash Zwingli (Switzerland) has the privilege for Hetalia), I may or may not change all of the names I used for Nyotalia Switzerland that I have used so far and set this name in stone -- Valerie Zwingli. It's probably one of the safer options, and it also holds good meaning "to be strong". Although both Adelheid and Amelie hold good meanings as well ("noble" and "industrious/fertile" respectively), the name Valerie quite fits, given that the character is always trying to keep a strong front at all times.
While I am aware that there are many characters whose Hetalia names don't match their Nyotalia counterparts, sometimes it is quite good a way to seek names that have the same letter as well, to explore different possibilities of good names with the same letter.