What is the meaning of Perła?

Alternative form of berła

pearl (shelly concretion, usually rounded and having a brilliant luster, with varying tints, found in the mantle, or between the mantle and shell, of certain bivalve mollusks, especially in the pearl oysters and river mussels, and sometimes in certain univalves)

pearl (gemstone made of pearls)

pearls (necklace made of pearls)

pearl (someone or something particularly outstanding or excellent)

Source: wiktionary.org