I agreee that after the birth, Dads are more likely to let mom win this argument! It was that way last time for us. I dropped the subject by 8 months, then after birth, he totally let go of the ugly boy name he wanted and just made completely new suggestions.
Also, with ds#1 I had a book of names. We each went through and marked the names we liked. ONLY 2 NAMES could we agree on- Isaac and Isaiah. They were not my first choices, but it was better than fighting!