Usual Name, Unexpected Nickname--Elizabeth/Isabella

Elizabeth remains one of our enduring classics. Despite the fact that everyone is almost guaranteed to know at least one (probably more like 2 or 3), Elizabeth shows no sign of falling out of favor anytime soon. In fact, many of its spin-offs are also on the rise (Elsa, Elise, Eliza), and one has even overtaken the original--Isabella. Considering that girls' names tend to rise & fall with fashion, while boys' names tend to be stable and enduring, Elizabeth's permanence is pretty darned impressive.
I wonder which came first--the widespread use, or the wide variety of nicknames?

• Bess (BES)--English
• Bethan (BETH-an)--Welsh
• Bettina (bet-TEEN-ah)--German
• Buffy (BUF-fee)--English
• Bizzy/Busy (BIZ-ee)--English
• Els (ELS)--Dutch
• Elsje (ELS-yeh)--Dutch
• Erzsi (EHR-zhee)--Hungarian
• Ibbie (IB-bee)--English
• Ilsa (IL-sah)--German
• Isa (EE-sah)--Scandinavian, Spanish
• Libby (LIB-bee)--English
• Liddy (LID-dee)--English
• Lies (LEES)--Dutch, German
• Liesel (LEE-zel)--German
• Liisu (LEE-soo)--Estonian
• Lili (LIL-ee)--French, German
• Lisa (LEE-sah)--English
• Lison (lee-ZOHN)--French
• Špela (SHPEL-ah)--Slovene
• Tetty (TET-tee)--English