According to Baby Name Wizard (American website and name books), the friendliest names are Adam, Andy, Ben, Charlie, Evan, Jack, Jake, Sam, Steve, Tim, Tom and Will for boys and Amy, Annie, Ellie, Emily, Katie, Laura, Molly, Sadie and Sarah for girls.
Obviously this is a few years out of date and mostly US based polling (plus might be on adult names too - how many baby Stevens and Timothys are there now?) but it seems people often find one or two syllable names "friendly", especially if they are nicknames or end in an "ee" sound - I must admit I instantly thought of Sam, Will, Jack and Tom for boys myself.