Viatrix is more like 'Traveller' than 'Voyager' - a more generalised meaning, and probably parents choosing that name would have been thinking about their daughter's journey through life.
The -trix ending is just 'woman who does something', eg
Victor = winner, Victrix = female winner. Also, in
Harry Potter,
Bellatrix = female warrior. It seems to me that there is not necessarily a link between
Viatrix and
Beatrix: V and B are often interchangeable in different languages:
Barbara and
Varvara,
Deborah and
Devorah etc. But in ancient and early
Christian Latin, the V would have a W sound, so that wouldn't work. The -i- in
Viatrix would have sounded like -ee-, and the -e- in
Beatrix like -ay-. And there seems to be no reason why parents would use
Viatrix as a stepping stone to
Beatrix. Surely they would just add the usual -trix ending to a newly significant religious word: beatus doesn't mean 'happy' as in 'cheerful' in
Christian Latin - there, it firmly means 'blessed'. And in preChristian Latin it means 'happy' or 'glad' or 'fortunate' but not 'cheerful' either - that would be laetus, as in
Laetitia. Which leaves
Beatrix, and
Beatrice, meaning 'woman who brings (or is?) a blessing/blessings.