Am I overreacting

So my partner has me as “babe” on his phone. But today he got home late, like several hours late from work, didn’t question it, but I sent him a link for party ideas for our daughters birthday coming up and his phone happened to me charging next to me and I was labeled as “Alonzo” which is my last name. So I confronted him about it and he got really defensive and started to call me crazy. Am I overreacting or should I investigate further.