Holub Name Meaning
Czech, Ukrainian, Belorussian, and Jewish (eastern Ashkenazic): nickname from Czech, Ukrainian, and Belorussian holub ‘dove’, ultimately related to Latin columba (see Colomb), denoting a mild-mannered or peace-loving man. As a Jewish name it is mainly ornamental.
Holub Name Meaning Czech, Ukrainian, Belorussian, and Jewish (eastern Ashkenazic): nickname from Czech, Ukrainian, and Belorussian holub ‘dove’, ultimately related to Latin columba (see Colomb), denoting a mild-mannered or peace-loving man. As a Jewish name it is mainly ornamental.
Source: Dictionary of American Family Names ©2013, Oxford University Press
likely from the same search you did
No, I know it because it's a popular Czech surname. The Polish variants include Hołubka and Hołubowicz.