I think it's perhaps a bit dated, I do think of a woman in her fifties or sixties.
Sandy is sweet but with it I mostly get an overwhelming connection to Grease.
Sandra is a beautiful name and underused anymore. It will be on the (admittedly long) list I present to my boyfriend to narrow down his choices from when the time comes.
I like (*s are especially beautiful)
Sandra CleoSandra Clio*
Sandra Edith Sandra EloiseSandra Eulalie*
Sandra Léonie
Sandra Lilac Sandra Lillian Sandra MabelSandra MelusineSandra MyrtleSandra PenelopeSandra VioletSandra Vivienne Sandra Wilhelmine