All the Ashleys and Sydneys I know are girls. I know two small girls named Elliott. They are called Ellie in daily life. The male Elliotts I know (and all related spellings) are all in their mid 30s and up.
I know equal numbers of male and female Logans, Dylans, Rileys, Cassidys, Caseys, Ryans, Ezras, Micahs, Glenns, and Jordans.
There are some surnamey names that are exclusively used for girls, as far as I can see - Harper, Kelly, Carrington, and a few others.
Some of these names are used because they shorten to recognizable girl names (Carrie from Carrington, for example).
For the most part, people using surname names for girls are following old Southern and WASP tradition though.
I'm in the US. People here tend to be polite about others' choices, but you can tell that some families prefer traditional names.