I'm kinda going for themes in my game. My founders last name is Crystal. So I named their kids Onyx, Ruby and Sapphire. Onyx got married an had 2 kids but because he has the last name of Crystal I named the children Amber and Rocky. Sapphire is dating a lovely lady sim called Raven Swann so I may go for something bird related when they have children because I want Sapphire to take Raven's surname. Then Ruby (unfortunately) is dating David Danger so maybe will have some danger element when they have children. I find if I have themes I can think of names easier. I am really fussy when it comes to names.