>
> Good evening........gott kveld; góðan aptan
> Rest Well...........sof vel! (= sleep well); hvíl vel!
> Safe journey........far heill!
> little one..........þú inn litli

Here are some suggestions, but I'm not infallible! I haven't seen any
examples of phrases like "good evening" in Old Norse. Where they ever
used as a greeting, I wonder? The typical all-purpose greeting
consists of variations of "heill!" or "heill þú!" or "vertu heill!",
meaning "be well".

Note: some of these word forms change depending on the gender of
whoever is being spoken to, and how many of them there are. The forms
above are those you'd find in a dictionary and are right for talking
to one male person. If one female person is addressed, you would
leave off the final -l of heill, thus: far heil! And for one little
female person: þú in litla. The other examples (vel, etc.) stay the
same.

If more than one person is being addressed, you would add the ending -
ið to the verbs: sofið, farið, hvílið. The adjectives change too.
For more than one male: farið heilir! For more than one female: farið
heilar! For a mixed group: farið heil! This is actually the neuter
plural, but it has the same form as the feminine singular.

Sometimes as a mark of respect, the plural forms are used when
addressing a king.

Llama Nom