The emoji data (properties, keywords and short names) are not available in ICU API yet.
Here's a rough draft API (ICU4J):
In addition, I suggest that we add access to the emoji properties for the latest version of Unicode Emoji (currently 4.0), including the full set of emoji characters plus sequences, using the standard property APIs (thus making them available in UnicodeSet, Regex, etc.).
The implementation could just stash a pointer to the RB for the language, then walk the RB when the name or keywords are fetched.