Shepherd is an occupational surname with a pleasant pastoral feel. It was chosen for their son by the Jerry Seinfelds, which might inspire others to follow their lead. Shepherd has been on the US Top 1000 a grand total of two years since the first list in 1880: 1887, when it was Number 906, and this past year, in 2016, when it was Number 863. That's a 129 year gap between appearances.
There are other spelling choices--Shepard, Sheperd, Sheppard--all of which lead to the friendly nickname Shep. Artist Shepard Fairey (original first name Frank) gained a lot of attention for his Obama HOPE poster.
Those various spellings are reflected in the surnames of such notables as astronaut Alan Shepard, "Winnie the Pooh" illustrator Ernest Shepard, actor/playwright Sam Shepard, "A Christmas Story" writer Jean Shepherd, Fox News anchor Shepard Smith, and actress Cybill Shepherd.