This isn't an issue with your mod, but rather with NewRatkinPlus:
Looking at RulePacks_Namers_Factions.xml under 1.5/Defs/Rulepack, it looks like NewRatkinPlus isn't using all of the possible namelists.

It defines possibilities for RK_FirstName under RatkinKingdomNameUtility:
[RK_Noun_Prefix_Flower]
[RK_First_ElfStyle]

And possibilities for RK_LastName under RatkinKingdomNameUtility:
[RK_Noun_Prefix_Nut]
[RK_Noun_Prefix_Iron][RK_Noun_Postfix_Ironlike]
Royal[RK_Noun_Postfix_BodyPart]
Wild[RK_Noun_Postfix_BodyPart]
[RK_Noun_Prefix_Nature][RK_Noun_Postfix_Mover]
[RK_Last_Single]

These are then used to define some of the firstname + lastname combos under NamerPerson_RatkinKingdom:
[RK_FirstName] + [RK_LastName]
[RK_First_ElfStyle] + [RK_Noun_Prefix_Flower]
[RK_First_ElfStyle] + [RK_Noun_Prefix_Flower]tea

You can combine namelists in pretty fun ways. For example:
[RK_Noun_Prefix_Nature][RK_Noun_Postfix_BodyPart] gets you Cloudheart, Thundertail, etc
[RK_Noun_Prefix_Color][RK_Noun_Postfix_Nature] gets you Blacklight, Silverfield, etc

I noticed that when I was adding male names, they include a file for male first names, but never actually use them, which was one of the things I went ahead and added. I considered more variants, but left it alone at the time because this was my first time modding and wanted to avoid potentially breaking things. Those are good suggestions though, so maybe I'll put those in an update.