On-Line Systems was renamed Sierra On-Line in 1982, and moved to Oakhurst, California.[6] The “Sierra” name was taken from the Sierra Nevada mountain range that Oakhurst was near

• Wikipedia page for Sierra Entertainment

You may be thinking of the fact that it was founded by a married couple, Ken and Roberta Williams, with the latter being among the first prominent female game designers.

On stackoverflow, they will answer aggressively

Just leave it there tbh