In 2018, 58 is the most common age for an American (U.S.) Clifford who is registered male with the Social Security Administration. It is the 441st most common male first name for living U.S. citizens.
― Anonymous User 10/8/2018
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I can only think of the big red dog, and it sounds more like a surname.
I think Clifford is a sweet and charming name that ages well for a young boy into a man. I love the name Cliff. However, working in education I am familiar with Clifford the Big Red Dog. I love those books and the cartoon. It wouldn't keep me from using the name, at least it's a positive association.
My name is Clifford, though I am often called "Cliff" in my professional life and by people I don't know (i.e. sales people or people who've read my name off a business card or lanyard/name plaque). However, my family and friends call me "Ford." I was named after my father's father, who was also called "Ford." So "Ford" is an acceptable diminutive form of "Clifford" and should be added to the list.As an aside, I always sign and show my full name as Clifford. To acquaintances and tangential contacts, I introduce myself as "Cliff". So, this distinction between Clifford, Cliff, and Ford has been very helpful in my life as I meet people daily and am often approached by people I don't immediately remember. The versatility of this name cues me to how I may know a person as I flip through my mental Rolodex. "Ford" from someone I don't recognize at all is usually a friend of a close friend.If I hear "Cliffie" or "Cliffmeister" I know that my Aunt Barb has come on the scene.It may not be that big of a deal for a small child, but it's useful in adulthood. Plus, the name "Ford" as a given name comes from this name, among others, and should be listed.I also know a "Clifford" who goes by "Clive" and another who goes by "Cleo".
It sounds a bit pretentious and snobby in its full form, but the nickname Cliff has a youthful, fun sound to it without being utterly immature. The name is admittedly a bit dated, though.