Friedrichs rhymes with:
deedrick's, dederichs, deedrick's, frederick's, fredericks, fredricks, hendricks, hendriks, hendrix, hendryx, kendricks, roderick's
Friedrichs sounds like:
fortier's, fortress, fortresses, forwarders, frederic, frederica, frederick, frederick's, fredericka, fredericks, frederico, frederika, fredric, fredrich, fredrick, fredricks, fridrich, friederich, friederike, friedrich, friedrick, furthers