Echo current product category name on single product detail page in Magento

Get the current category name on your current product/product detail page in Magento.

  $categoryIds = $_product->getCategoryIds();
        if(count($categoryIds) ){
            $firstCategoryId = $categoryIds[0];
            $_category = Mage::getModel('catalog/category')->load($firstCategoryId);
            echo $_category->getName();
        }

$categoryIds = $_product->getCategoryIds();

if(count($categoryIds) ){

$firstCategoryId = $categoryIds[0];

$_category = Mage::getModel('catalog/category')->load($firstCategoryId);

echo $_category->getName();

}

Change [0] to [1] to get the 1st child level category.