Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Ship | Builder | Namesake | Renamed | Laid down | Launched | Commissioned or completed(*) |
| --- | --- | --- | --- | --- | --- | --- |
| Ajax | Snowden & Mason, Pittsburgh, Pennsylvania | Manayunk, Philadelphia | Manayunk, 1862; Ajax, 15 June 1869 | 1862.0 | 18 December 1864 | 27 September 1865* |
| Canonicus | Harrison Loring, Boston, Massachusetts | Canonicus | Scylla, 15 June 1869; Canonicus, 10 August 1869 | 1862.0 | 1August1863 | 16 April 1864 |
| Catawba | Alexander Swift & Company, Cincinnati, Ohio | Catawba River | Atahualpa | 1862.0 | 13 April 1864 | 10 June 1865* |
| Mahopac | Secor & Co., Jersey City, New Jersey | Lake Mahopac | Castor, 15 June 1869; Mahopac, 10 August 1869 | 1862.0 | 17 May 1864 | 22 September 1864 |
| Manhattan | Perine, Secor & Co., Jersey City, New Jersey | Manhattan Indians | Neptune, 15 June 1869; Manhattan, 10 August 1869 | 1862.0 | 14October1863 | 6 June 1864 |
| Oneota | Alexander Swift & Company, Cincinnati, Ohio | Oneota Tribe of the Sioux Indians | Manco Cápac | 1862.0 | 21 May 1864 | 10 June 1865* |
| Saugus | Harlan & Hollingsworth , Wilmington, Delaware | Saugus, Massachusetts | Centaur, 15 June 1869; Saugus, 10 August 1869 | 1862.0 | 8 February 1864 | 27 August 1864 |
| Tecumseh | Charles Secor & Co., Jersey City, New Jersey | Tecumseh | Not Applicable | 1862.0 | 12 September 1863 | 19 April 1864 |
Question:
What is the namesake of the ship that was commissioned or completed(*) 16 april 1864?
Answer:
Canonicus