iMessage sent to me by spouse shows receivers name (mine).
There are several possibilities:


As @jksoegaard has indicated, you and your spouse are sharing an AppleID  
You and your spouse are sharing an iPad or Mac  
You or your spouse have gotten a contact mis-labeled  
You and your spouse are doing research for a new comedy show  


If none of those address your issue, you could Google iMessage from spouse says it's from me, and start reading through the responses. In any case, the number of hits from this search should give you some comfort as you'll learn you're not alone.