Magregor and Mcgregor Family of Philadelphia PA Need Information

Looking for any information on my great great-grandfather Edwin Magregor. He came from Liverpool to Philadelphia in about 1855 as a minor. He was born at sea. I cannot locate any birth information or passenger/ship information. I have his naturalization papers. He married Sarah H. Leach and was a Presbyterian. The family their name Magregor until the second generation came along and they changed the spelling to McGregor. They lived in the Kensington area of Philadelphia around Ann St. Any information would be appreciated.