LN: Occupational name
SO: FN begins with the same letter as LN. MN is Irish (not a surname).
SO: FN is Ancient Roman. MN is unisex.
DD: FN is Welsh. MN is a colour.
DS: FN ends in A. MN is a word for an animal in a language other than English.
DS/DS: Both have one syllable FNs. MNs are surnames of writers.
DD: FN is from Celtic Mythology. MN is a feminised version of a male name.
DS: FN is Medieval. MN is a from nature.
DD: FN's meaning has something to do with water. MN is an unusual virtue name.
Ddog: Name of a God or Goddess.