
1) Admiral rickover 2) Hebrew boy name 3) Rickover 
Found on 
https://www.crosswordclues.com/clue/hyman

 Hyman is the surname of: Hyman is the given name of: ...
Found on 
http://en.wikipedia.org/wiki/Hyman

The USS Hyman was an American Allen M Sumner Class destroyer of 2200 tons displacement launched in 1944. The USS Hyman was powered by four boilers providing a top speed of 36.5 knots. She carried a complement of 350 and was armed with six 5 inch guns; twelve 40 mm anti-aircraft guns; eleven 20 mm anti-aircraft guns and ten 21 inch torpedo tubes arr...
Found on 
http://www.probertencyclopaedia.com/browse/RH.HTM
  No exact match found.