Hello from Ishpeming, I remember being in contact with you in the past, I was born and raised about a block from Elson's Bottling Works. I have looked at other sites, and, Gustaf's father is also listed there as Johan Ruuska, and, his mother was Lena, which is most often used instead of Helen in the records. So, it's very possible that the record you found in Ylihärmä is the place where he was born. There was a Kauppila, (Kaupila) Farm in the area, but, Gustaf isn't listed as being born there. I had the same thing with my paternal grandfather, he used the farm name Koski when he came to Michigan. His actual name was Antti Lesell, and, changed his name to Andrew Matson! So, you aren't alone when you wonder why names are different. I'll do some more searching, and, I'll let you know if I find something.