Whitman?

I have no idea about this painting. It looks legit oil painting but the signature is suspect. It just says “WHIT MAN” in an orange/red color. I found it going through my mom’s storage unit and it apparently belonged to my grandparents. I don’t know if it was real and they just painted the name or if it’s fake. Wife wants me to toss it out but I thought I’d see if it had any value first.