Middle name for Seren

[attheendoftheday]

Can anyone suggest a good middle name for Seren? We have one dd already called Rowan Fritha, the surname is a single syllable. Dp and I are quite keen on having a less usual middle name, we like anglo saxon, scandanavian or welsh names particularly, or nature names, and I'd like to avoid biblical names. Our current ideas are:

Seren Freya
Seren Leaf
Seren Eirian

But I'm not really happy with any of them and don't think they scan right.

Any ideas?

I am welsh and know four Eirians- they are all female. Don't know any male ones. As for Seren: How about Seren Rhos (Rhosyn is welsh for rose)

Seren Alexandra
Seren Marguerite
Seren Victoria
Seren Josephina