Alvis seems very close to
Alvise, which is in BtN's database as a variant of
Louis.
This page here:
http://heraldry.sca.org/laurel/names/pisa/pisa-given-freq.htmlexplains Masseo as a variant of
Matteo.
Not sure about Monaldo. It has a sound as of Germanic origin. This page here of questionable reliability:
http://www.italia-mia.it/nomi/monaldo.aspseems to hint at a combination of Old High
German words munt and waltan, but I could not find a corresponding
German name Mundwald which should probably result, only a Old High
German common word 'mundwald' with a meaning of 'guardian' or 'custodian'.
Rene www.AboutNames.ch