[name]Lyndsay[/name] -
[name]Lincoln[/name] makes me think of two things - [name]Lincoln[/name] Logs and, well, [name]Abe[/name]!
That being said, how is [name]Lincoln[/name] any different than [name]Hudson[/name], [name]Landon[/name], [name]Griffin[/name], [name]Franklin[/name], or [name]Reagan[/name]? It isn’t! [name]Lincoln[/name] has strength and substance - especially with that CK sound - but an added splash of spunk and fun! Who could pass up a guy named [name]Link[/name], huh? I mean, [name]Tracy[/name] Turnblad in Hairspray certainly couldn’t!
When I envision [name]Lincoln[/name], I see a buttoned-up, confident, friendly guy. He’s no goody-two-shoes, though. No, [name]Lincoln[/name] has a bit of a wild side - he doesn’t always follow the rules, and he is a fearless leader. He is strong and convincing, but that doesn’t mean he is a bad boy. [name]Lincoln[/name] is smart, for sure, and talented - maybe a musician - but he has a strong personality. [name]Link[/name] is cool and suave, handsome and witty, and he knows it…
Good name, even better nickname, [name]Lyndsay[/name]!
[name]Lemon[/name] 
[name]Edit[/name] - I forgot to answer the second part of your question! To me, [name]Dashiell[/name] has a vintage quirkiness that isn’t quite captured in [name]Lincoln[/name]. [name]Lincoln[/name] is more surname-y (obviously!) and thus makes [name]Dashiell[/name] seem more modern and fresh, too - not that it isn’t already (!), just more so, if you get what I’m saying. [name]Dash[/name] and [name]Link[/name], however, are perfect together! Can’t actually think of a better nickname pairing! [name]Both[/name] are energetic and fun, yet strong and handsome, just like their full names! 