Hannah Parr, Atalanta, Alma ships

My great great grandfather was a Norwegian sailor who emigrated to England in the late 1800s. His name was Samuel Cooper (obviously not very Norwegian) on the English Census and he was born in Norway in about 1847. He named his children: Hannah (girl), Alma (boy), Atalanta (girl) and Lema (boy). We wondered whether he named his children after ships he had sailed on? He would have been in his early 20s when the Hannah Parr, Atalanta and Alma sailed from Norway. I can not find "Lema" anywhere yet. My questions are: would he have changed his name to a more english name on arrival in England? Is there anyway I can find out? Are there crew lists for the above named ships? Is our theory of naming after ships likely? Does anyone know of the name Lema as a ship or a nautical word? Or is Lema related to a place in Norway or a Norwegian word? Many thanks. Catherine