I really like Eleazer, but prefer Eliezer (which is a different name with a similar meaning, and also Elie Wiesel’s name) as it looks sleeker. However, it’s a very clunky and angular name either way, so that’s a pretty major reservation I have.
Anselm has gravitas and is an amazing middle name, especially with a classic first name (James Anselm, Henry Anselm, Theodore Anselm…), but I find it too serious and harsh for a first.
Keane (less wordy spelled this way IMO) is a solid name, not a favorite. It leans more surname-ish than anything else.
The rest tend to be too clunky/nerdy (I have trouble with the Os- prefix) for me though.