Bruno, Ferdinand, Conrad, Maxwell would all be great. As would most of the names suggested by Bluestocking
But, IF it matters, many of the other names suggested above appear in the Bible, including Luca/Lucas, Elias, Simeon, Benjamin, Raphael, Thomas, Marco, Mateo (=Matthew), Felipe (Phillip), David, Sam (Samuel), Piers(=version of Peter), Andrew/Andreas/Andre, Gabriel, Felipe/Philip. Ivan = John in many European languages, and is Biblical, too.
All those above are names of people who were actively religious, IFYSWIM. Many more ancient Greek and Roman names, such as Alexander or Victor, are also mentioned in the Bible, as part of the general narrative.
I don't know how particular you want to be, but here is a list of Bible names:
www.behindthename.com/names/usage/biblical
If you are wanting to avoid religious names, then that is going to be even more difficult!
Dominic, Francis/Francesco and Xavier are all names of famous Christian leaders. Many other names listed above (eg Sebastian, Nicholas) are linked to well-known Christian saints.
Celtic, Norse or old Germanic names are probably safer, such as Bernard, Rudolf, Frederick, Hubert, Erik, Gerard, Rudolf, Florian, Fabian, Walter, Roland, Robert, Cedric, Finbar, Merlin, Louis/Lewis or Arthur (he was only a mythical king .... and unrelated to the British royal family). Albert is used throughout Europe, and might also be OK, since he was originally German, though he married Q Victoria. There are many more Old English/Germanic names, but the best-known have been used by British royals, for example, Richard, Edward, Edmund, Edgar, Henry, William...