the character 'Leopold Bloom' is taken from

Ulysses, a novel by Irish writer James Joyce, first published in book form in 1922.
All the action of Ulysses take place in and immediately around Dublin on a single day.

The three central characters—Stephen Dedalus, Leopold Bloom; and his wife, Molly.
They are intended to be modern counterparts of Telemachus, Ulysses, and Penelope, respectively, and the events of the novel loosely parallel the major events in Odysseus’s journey home after the Trojan War.

Source: Britannica.com