Nevin /nev-in/ [2 sylls.] as a boys' name is of Latin origin, and the meaning of Nevin is  holy, sacred; little bone; servant of the saint's disciple. Anglicization of Gaelic names with the given meanings. The name sounds similar to the popular Kevin.
About Labrador Retriever Lifespan. When we think about the Labrador retriever lifespan there are of course many factors to consider including the breeding and early health of the dog. But, a generally accepted lifespan for a typical Labrador is 10 - 12 years. Of course there are many exceptions to that rule of thumb with many Labs living to a ripe old age and others, unfortunately, passing away at a younger age.
Just as with humans, that figure can vary widely, but a good average for Labradors is 12 or 13. Of course, good care and balanced feeding, regular exercise and plenty of mental stimulation, frequent health checks at the vets as well as freedom from disease can ensure that your lab enjoys a good long life.