Some of my friends called the Zeta Psi house "Zeta Pitchfork"
We also had a chapter of Theta Chi, that kept getting read as OX - they went with it, and called their rush "OX HUNT".
I was a chapter founder of AEPhi at a school that had had a chapter of AEPi for a long time. I kept getting asked when I'd become a little sister of AEPi, or who my boyfriend in AEPi was, or when AEPi had gone coed. You would think that at an engineering school, people could tell the difference between pi and phi.
Before I was an AEPhi, I was in a local sorority called Sigma Iota Phi. People thought my letters spelled "sip". It didn't help that intramural sports teams from GLOs got a 2 or 3 letter designation based on the Greek letters for use on schedules and rosters, and our code was SIP. "Yeah, we're playing the Sips today..."
It was very common for student organizations other than GLOs to "adopt" Greek letters and make up lettered shirts (e.g. Lecture Series Committee = LSC =
LSC. One group, the Student Information Processing Board (SIPB), had adopted the letters
SPB. I used to get "Sigma Iota Phi... ohhh, you must be in SIPB!"