It's pretty common. My wife and I have a lawyer friend who handles small matters for us for the low, low cost of buying her meal the next time we go out. Plus I fix her (aluminum wired) electric.
But yes I do agree, it's probably a minority of people that regularly use a specific lawyer.
I figure the number of lawyers willing to do such small favors is in the range of 1% to 10% of the 1.3M (wild guess). So if each of them had 100 friends-and-family "clients", it still wouldn't add up to "pretty common".
Also further reduce your number for adults in the name age bracket as practising lawyers.