September 2017 Update

Task/Number-names/Jq/number-names-1.jq

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+# Adapted from the go version.
+# Tested with jq 1.4
+#
+# say/0 as defined here supports positive and negative integers within
+# the range of accuracy of jq, or up to the quintillions, whichever is
+# less.  As of jq version 1.4, jq's integer accuracy is about 10^16.
+
+def say:
+
+  # subfunction zillions recursively handles the thousands,
+  # millions, billions, etc.
+  #   input: the number
+  #   i: which "illion" to use
+  #   sx: the string so far
+  #   output: the updated string
+  def zillions(i; sx):
+    ["thousand", "million", "billion",
+      "trillion", "quadrillion", "quintillion"] as $illions
+    | if . == 0 then sx
+       else (. / 1000 | floor)
+            | (. % 1000) as $p
+            | zillions(i + 1;
+                       if $p > 0 then
+                          (($p | say) + " " + $illions[i]) as $ix
+                          | if sx != "" then $ix + ", " + sx
+                            else $ix
+                            end
+                       else sx
+                       end)
+       end
+  ;
+
+  [ "", "one", "two", "three", "four", "five", "six", "seven",
+    "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen",
+    "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"] as $small
+  | ["ones", "ten", "twenty", "thirty", "forty",
+     "fifty", "sixty", "seventy", "eighty", "ninety"] as $tens
+
+  | if . == 0 then "zero"
+    elif . < 0 then "minus " + (-(.) | say)
+    elif . < 20 then $small[.]
+    elif . < 100 then
+        $tens[./10|floor] as $t
+        | (. % 10)
+        | if . > 0 then ($t + " " + $small[.]) else $t end
+    elif . < 1000 then
+        ($small[./100|floor] + " hundred") as $h
+        | (. % 100)
+        | if . > 0 then $h + " and " + (say) else $h end
+    else
+        # Handle values larger than 1000 by considering
+        # the rightmost three digits separately from the rest:
+        ((. % 1000)
+         | if . == 0 then ""
+           elif . < 100 then "and " + say
+           else say
+           end ) as $sx
+        | zillions(0; $sx)
+    end ;
+
+say

Task/Number-names/Jq/number-names-2.jq

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+0
+"zero"
+-0
+"zero"
+111
+"one hundred and eleven"
+1230000
+"one million, two hundred and thirty thousand"
+123456
+"one hundred and twenty three thousand, four hundred and fifty six"
+123456789
+"one hundred and twenty three million, four hundred and fifty six thousand, seven hundred and eighty nine"
+-123000000123
+"minus one hundred and twenty three billion, one hundred and twenty three"
+12345678912345678
+"twelve quadrillion, three hundred and forty five trillion, six hundred and seventy eight billion, nine hundred and twelve million, three hundred and forty five thousand, six hundred and seventy eight"