There do not appear to be that many with the name VABOLIS, back in the days of my grt-grandfather, Konstantin Vabolis (c. 1864-1940).
I have finally located, in the US Census, all of his children, but of those still living, no one knows Konstantin's parents' names. It doesn't appear that they immigrated to the US. I have not found any documents with his parent's names either.
All that I know is that Konstantin says, through the US Census, that he was married prior to coming to the US in 1892, to Anna YODIS/JODIS (or there may be another spelling).
Supposedly, members of both families, Vabolis & Jodis, immigrated at about same time. I heard but have no proof that Konstantin had a brother called "Boli." Anna's parents were Alex & Antoinette Jodis,
It is possible that there is a connection to your grt-grandfather Matas Vabolis...his being a brother or cousin to Konstantin. How I wish I could say definitely.