Every object has to have a name, people notwithstanding. Lest we do a lot of pointing, and when out of sight, have no means to describe what or who the object of discussion is. There are many other roots of names depending on the nationality.
Some names seem to have arrived at the same spelling from different beginnings.
Gossett may have been one of the those. It could have been any one of the above depending upon the circumstances surrounding the individual given record. It doesn't take an etymologist or a student of paleography to recognize that the spelling of the name seems to have jumped around a little, sometimes quite a bit. There are several reasons that could account for some of the various spellings. The cause of some changes may be lost in time and never explained.