Current list of female Hrothgar first names (taken from Helion and Hrothgar surnames with their prefix/suffix removed):

Anatalya
Branka
Deanna
Dita
Enya
Inivi
Jolla
Jova
Lentya
Lina
Liuba
Maev
Marya
Milan
Mira
Mirka
Mov
Nata
Ona
Ova
Petya
Ratya
Redna
Rodica
Slana
Stana
Stolla
Svana
Svena
Tessa
Tira
Tolna
Ulga
Vesna
Vira
Yurya
Zetina
Zlata
Zora
Zorya

Currently, Lost Hrothgar have the first name of their queen with -sch (meaning lost) to form their surname. I doubt this will change with the arrival of FemHroth, though we might see a variation of a FemHroth who abdicated or abandoned the throne?

Helion FemHroth have a much more interesting potential. Currently, the prefix a- (meaning in service to) is attached to the name of the Queen. I'm curious to see what prefix, suffix, or alltogether new title is used to denote a Queen. I have a sneaking suspicion that it will include 'hildr' or 'gunnh' in some way. Either way, I'm looking forward to see what we find out come 06/28.