For my own future reference, here’s a list of all available UIFont Family names in iOS 8:

Academy Engraved LET

Al Nile

American Typewriter

Apple Color Emoji

Apple SD Gothic Neo

Arial

Arial Hebrew

Arial Rounded MT Bold

Avenir

Avenir Next

Avenir Next Condensed

Bangla Sangam MN

Baskerville

Bodoni 72

Bodoni 72 Oldstyle

Bodoni 72 Smallcaps

Bodoni Ornaments

Bradley Hand

Chalkboard SE

Chalkduster

Cochin

Copperplate

Courier

Courier New

DIN Alternate

DIN Condensed

Damascus

Devanagari Sangam MN

Didot

Euphemia UCAS

Farah

Futura

Geeza Pro

Georgia

Gill Sans

Gujarati Sangam MN

Gurmukhi MN

Heiti SC

Heiti TC

Helvetica

Helvetica Neue

Hiragino Kaku Gothic ProN

Hiragino Mincho ProN

Hoefler Text

Iowan Old Style

Kailasa

Kannada Sangam MN

Khmer Sangam MN

Kohinoor Devanagari

Lao Sangam MN

Malayalam Sangam MN

Marion

Marker Felt

Menlo

Mishafi

Noteworthy

Optima

Oriya Sangam MN

Palatino

Papyrus

Party LET

Savoye LET

Sinhala Sangam MN

Snell Roundhand

Superclarendon

Symbol

Tamil Sangam MN

Telugu Sangam MN

Thonburi

Times New Roman

Trebuchet MS

Verdana

Zapf Dingbats

Zapfino