"You don't have to tell me your full name if you're not ready." Damien interrupted the silence. "I just want to know how to call you when we're alone…"
"Ah…" Lane pressed his lips.
Even if it was just the first name, he couldn't say it was 'Lane'. If Damien were to start digging - which was what Lane expected him to do - then he would undoubtedly be able to find something about 'Lane Allen'. Then, with his current status, and his connection to the Allen Guild, and how he wasn't on good terms with his 'family', wouldn't it be pretty obvious that was his real identity? Damien was smart enough to be able to connect all the dots.
But saying a random name would also be…
Ah!
All of a sudden, a flash of inspiration struck him, and he quickly said, "Jonathan. My first name was Jonathan."