The spelling of the word "mathison" has a few different potential interpretations when it comes to its pronunciation. One possibility is that it's pronounced with a long "a" sound, in which case it might be spelled "Mae-thi-son" (IPA: meɪθɪsən). Alternatively, it could be pronounced with a short "a" sound, as in "Mah-thi-son" (IPA: mæθɪsən). Without more context, it's difficult to say for sure which version is correct, but both would be spelled the same way.