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Great! "Broneslav" seems to be best choice. And it even sounds similar to "Brandon".

"Strong defender"? Ok, you may try something archaic in style, like Ratobor, Ratislav or Svyatopolk, although neither translates this accurately.

"Brandon" seems to be name of celtic origin. If you can tell its original meaning, I'll try to suppose some russian equivalent.

:lol: But don't listen to V.