Short as in # of syllables or # of letters or both? For e.g. is Spencer too long?
How about:
Lane, Joss, Nell, Gwen, Honey, Liz, Lynn, Tate, Becca, Lois, Autumn, Jen, Lumi, Zadie, Renee, Zana, Kay, Amy, Nala, Bryn, Roxy, Sage, Rhea, Mary, Ruby, Lucy, Lana, Viv, Cher, Blaire, Dove, Ida, Wren, Elle, Marie, Lola, Nia, June, Alba, Uma, Dana, Coral, Val.
Clint, Tom, Sean, Art, Charles, Dean, Miles, Reid, Seth, Matt, Zack, Rich, Jace, Ash, Ross, Cash, Rhett, Abe, Louis, Finn, Charles, Dale, Vaughn, Ike, Josh, Giles, Pierce, Chris, Cole, Van, Jay, Shane, Jett, Rich, Alex, Fox, Kurt, Beau, Vern, Cliff.