I have encountered the compound name Collineau-DeMontaguere several times in researching my family tree. Only once is a personal name connected to it, Marguerite. Collineau is the unknown mother's maiden name and DeMontaguere is the father's name. I have several dates for each but no first names and the children listed are numerous and have a variety of family names.
There seems to be a number of things wrong with all of these records which suggests that numerous errors have crept in.
There is one less garbled reference to a Miss Collineau-DeMontaguere, however. Perhaps the Father's name is Thomas Gagnon and the Mother's name is Collineau. It looks like in this case a title or location has been garbled together with the Father's name.. This may be the origin of these garbled records. There might be a real Collineau DeMontaguere marriage somewhere.
I just read a series of posts in a Geni family tree forum that suggests the problem may have started there by inadvertantly merging a number of different women, possibly named Collineau. This would explain the large number of children bearing the names of various men. I recommend that you ignore this couple and replace them with "Unknown" or remove them altogether.
The trouble with the use of software in genealogy is that it is far too easy to make errors and to duplicate and multiply them indefinately. My family tree is large and riddled with errors created by software, hardware, other people, and myself. It's mostly reliable but it is now difficult or impossible to clean up. Be careful and think careful before you accept any thing as correct. Don't jump to conclusions. Consult sources outside of the commercial and free genealogy website circuit.