Lots of 3 or 4 syllables names ending in a or y - Emily, Felicity, Amelia, Isabella. And in fact some two syllable - Clara, Lucy.
I quite like a lot of frilly names, but if you want to avoid, go for a noun end, or an a end with a strong sound or classic association eg Alexandra, Julia.
Avoid cottage core / Victorian early 20th C revival - from Emma to Mabel
No flower or nature or precious stone names either
Hyphenated names like Lexie May are clearly frilly but also thought of as downmarket...
Gudrun should be safe enough...