Seems in the future that a woman taking her husband's last name is purely optional. It's highly unlikely that Samantha's husband's name is Greskrendtregk Wildman. So apparently Sam kept her own surname and also passed it on to Naomi.
Also in TNG, Beverly's maiden name was Howard, but this was also the last name of her Grandmother. In "Sub Rosa", Ronin romanced all the "Howard women", going WAY back. So it seems that Bav broke tradition by changing her last name to Crusher, when otherise Howard seems to have been passed matrilinearly.