Before we begin, add Vikingr (long i) and Vali (long a) as occupational
names - man in a vik, and warrior; and Thrasi, same, and Imi (long i)
as a body-name, attested weak, meaning dark, and Soti (long o), from
the word for soot, black, especially hair, as a body-related name.
Also, masc. Dalli and fem. Dalla attested as light-names.

Fundinn, Froekn (long oe), Fastr, Vigr (long i), Vakr, Thrainn (long
a), Ofurr (hooked-o), Ogurr (hooked-o), Ondottr (hooked-o, long o),
Rikr (long i), Katr (long a), Hvatr, Hrappr, Jafn, Egill, Audr, Agni,
Atall, Snortr (hooked-), Spakr, Tryggr, Teitr, Djarfr. Some are also
attested weak, or only weak: Frakki, Uggi, Kati (long a), Helgi, Audi
(dh), Atli, Tryggvi, Dyri (long y), Dyggvi. Attested feminines are
Fridr (long i, dh), Frida (same weak), Ogn (hooked-o), Ondott (hooked-
o, long-o), Kata (long a), Helga, Auda (dh), Agla. Some meanings:
Clever, Fierce or Bold, Fast as in Steadfast or Firm, Able to Kill,
Awake, Desirous or Eager, Over or Powerful, Threatening, Spiritual or
Breath- or Soulish (technically a suffix -ottr here), Powerful (later
Rich), Happy or Glad, Eager, Fast as in Quick, Even, Threatening, Rich
as in Wealthy, Threatening, Rough, Fast as in Quick, Tame or Wise,
True, Happy or Glad, Bold as in Brave; Rash or Bold, Threatening, Happy
or Glad, Holy, Rich is in Wealthy, Rough, True, Dear as in Expensive or
Beloved, Virtuous. Feminines the same, but Fridr beautiful. Note the
rare and strong fem. Ogn, which matches the weak masc. Agni (perhaps
there was *Agnr, which was harder to pronounce than the weak). All
attested names, and adjectival in the sense that all of the words are
adjectives in ON, or at least thought to have been so in cases where
they are rare. Note patterns or re-occuring meaning in more than one
name - this says something about how ON folk though that folk should
be, and gives us some idea about their ideals for for folk. A feminine
Atla is attested as a Trollkonuheiti, a late category of names used for
troll-women in Christian times, but most likely only with very partial
roots in heathen times. Rough women might not have made sense in later
times, but *Atla as a women's name would likely have made sense in
heathen times, just as another so-called Trollkonuheiti, Ama (long a),
would. Amr (long a) is attested as a man's name, and we can add it to
body-related names, meaning dark. My hunce is that heathens would have
had no problems with women being called Dark, especially when they were
dark-haired, mysterious, witches, or what-have-ye - simply a fact of
life then, I would think. *Atla, *Ama - consider also *Rika (compare
Auda), *Teita (compare Kata and masc. Katr, Kati, Teitr), *Spok, *Trygg
or *Tryggva, *Dyra, *Dyggva - all women's names that would seem to make
very good sense. And as far as the threatening names are concerned,
look at Ogn and Agna - apparently ok for women. Also, the names Ondottr
and Ondott mean something closer to fierce in ON than spiritual, which
is just literal. So here are some more names, in this case not so well
organized by meaning, but hopefully present in a way that helps make
sense of them. -Konrad