Finigan, Finnegan, Finnigan, misc spellings by officials.
Frank Finnigan is listed in the San Francisco city Directory as a horseshoer from 1908-1913 and in the 1910 Census. They did not seem to be in the 1900 census.
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San Francisco City Directory listings:
1889: Francis Finnegan, McNeil Bros., helper, 40 Clara
1889: Catherine Finnegan, ______, Widow, 40 Clara
1890: Frank Finnegan, McNeil Bros., horseshoer, r. 40 Clara
1890: Catherine Finnegan, ______, Widow, r. 40 Clara

1908: Finnigan Frank, horseshoer, r 724 Natoma
1909: Finnigan Frank, horseshoer, r 724 1/2 Natoma
1910: Finigan Frank, horseshoer, r 724 1/2 Natoma
1911: Finnegan Frank, horseshoer, r 724 Natoma
1912: Finnigan Frank, horseshoer, r 726 Natoma
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"FENTON--In this city, June 29, to the wife of M.J. FENTON, a son." Source: San Francisco Daily Morning Call, 1 July 1873.

"FENTON--In this city, July 3, Maria T., wife of M.J. FENTON, a native of Ireland, aged 23 years. Friends and acquaintances are respectfully invited to attend the funeral TO-DAY (Friday), at 3 o’clock p.m. from 221 Clara St."
Source: San Francisco Daily Morning Call, 4 July, 1873. Transcribed by Jill Crowhurst Chesnik.