Chelli is right. The first rule of Latvian genealogy is that when it comes to names of people or places, spelling - particularly the ending of the name - doesn't matter (as long as when you sound it out it sounds the same), because grammatical case will have an effect. For example, my surname, Celmiņa, is the feminine form of the masculine "Celmiņš". The plural would be "Celmiņi", which is also a common farm name, but I have also seen farms that are just "Celmiņš" (singular).
I'd recommend looking at this blog post of mine for more information on how spellings can change over time: http://www.celmina.com/genealogy/2012/1 ... thography/